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Mathematics is full of weird number systems that most people have never heard of and would have trouble even conceptualizing. But rational numbers are familiar. They’re the counting numbers and the fractions—all the numbers you’ve known since elementary school. But in mathematics, the simplest things are often the hardest to understand. They’re simple like a sheer wall, without crannies or ledges or obvious properties you can grab ahold of.

Minhyong Kim, a mathematician at the University of Oxford, is especially interested in figuring out which rational numbers solve particular kinds of equations. It’s a problem that has provoked number theorists for millennia. They’ve made minimal progress toward solving it. When a question has been studied for that long without resolution, it’s fair to conclude that the only way forward is for someone to come up with a dramatically new idea. Which is what Kim has done.

“There are not many techniques, even though we’ve been working on this for 3,000 years. So whenever anyone comes up with an authentically new way to do things it’s a big deal, and Minhyong did that,” said Jordan Ellenberg, a mathematician at the University of Wisconsin, Madison.

Over the past decade Kim has described a very new way of looking for patterns in the seemingly patternless world of rational numbers. He’s described this method in papers and conference talks and passed it along to students who now carry on the work themselves. Yet he has always held something back. He has a vision that animates his ideas, one based not in the pure world of numbers, but in concepts borrowed from physics. To Kim, rational solutions are somehow like the trajectory of light.

If the connection sounds fantastical it’s because it is, even to mathematicians. And for that reason, Kim long kept it to himself. “I was hiding it because for many years I was somewhat embarrassed by the physics connection,” he said. “Number theorists are a pretty tough-minded group of people, and influences from physics sometimes make them more skeptical of the mathematics.”

But now Kim says he’s ready to make his vision known. “The change is, I suppose, simply a symptom of growing old!” wrote Kim, 53, in one of the first emails we exchanged for this story.

He has recently hosted a conference that brought together number theorists and string theorists. He has also drafted articles that begin to describe his inspiration to a mathematical community that is not accustomed to thinking about numbers through such direct analogy with the physical world.

Yet one stumbling block remains—a last piece of the physics-math analogy that Kim still has to work out. He hopes that by inviting others into his vision, especially physicists, he’ll have the help he needs to complete it.

### The Ancient Challenge

Rational solutions to equations exert a strong pull on the human mind. They are satisfying in the way of puzzle pieces falling perfectly into place. For that reason, they are the subject of many of the most famous conjectures in mathematics.

The rational numbers include the integers and any number that can be expressed as a ratio of two integers, such as 1, –4 and 99/100. Mathematicians are particularly interested in rational numbers that solve what are called “Diophantine equations” — polynomial equations with integer coefficients, like x^{2} + y^{2} = 1. These equations are named after Diophantus, who studied them in Alexandria in the third century A.D.

Rational solutions are hard to find in any kind of comprehensive way because they don’t follow any geometric pattern. Think about that equation x^{2} + y^{2} = 1. The real-number solutions to that equation form a circle. Take away all the points on that circle that can’t be expressed as a fraction and you’re left with all the rational solutions, which don’t form such a tidy object. The rational solutions appear to be scattered randomly around the circumference of the circle.

“The condition for a point to have rational coordinates is not a geometric condition at all. You can’t write an equation that the rational points have to satisfy,” Kim said.

It’s often easy to find a single rational solution, or even many of them. But mathematicians, who don’t like loose ends, are more interested in identifying all the rational solutions. That’s much harder. It’s so hard, in fact, that proving even the barest statement about the number of rational solutions is enough to make you a mathematical luminary. In 1986 Gerd Faltings won the Fields Medal, math’s highest honor, primarily for solving a problem called the Mordell conjecture and proving that certain classes of Diophantine equations have only finitely many rational solutions (rather than infinitely many).

Faltings’ proof was a landmark result in number theory. It was also what mathematicians refer to as an “ineffective proof,” meaning that it didn’t actually count the number of rational solutions, let alone identify them. Ever since, mathematicians have been looking for a way to take those next steps. Rational points look like random points on the ordinary graph of an equation. Mathematicians hope that if they change the setting in which they think about the problem, those points will start to look more like a constellation that they can describe in some precise way. The trouble is, the known land of mathematics doesn’t provide such a setting.

“To get effective results on rational points, it definitely has the feeling that there’d have to be a new idea,” said Ellenberg.

At present, there are two main proposals for what that new idea could be. One comes from the Japanese mathematician Shinichi Mochizuki, who in 2012 posted hundreds of pages of elaborate, novel mathematics to his faculty webpage at Kyoto University. Five years later, that work remains largely inscrutable. The other new idea comes from Kim, who has tried to think about rational numbers in an expanded numerical setting where hidden patterns between them start to come into view.

### A Symmetry Solution

Mathematicians often say that the more symmetric an object is, the easier it is to study. Given that, they’d like to situate the study of Diophantine equations in a setting with more symmetry than the one where the problem naturally occurs. If they could do that, they could harness the newly relevant symmetries to track down the rational points they’re looking for.

To see how symmetry helps a mathematician navigate a problem, picture a circle. Maybe your objective is to identify all the points on that circle. Symmetry is a great aid because it creates a map that lets you navigate from points you do know to points you have yet to discover.

Imagine you’ve found all the rational points on the southern half of the circle. Because the circle has reflectional symmetry, you can flip those points over the equator (changing the signs of all the y coordinates), and suddenly you’ve got all the points in the northern half too. In fact, a circle has such rich symmetry that knowing the location of even one single point, combined with knowledge of the circle’s symmetries, is all you need to find all the points on the circle: Just apply the circle’s infinite rotational symmetries to the original point.

Yet if the geometric object you’re working with is highly irregular, like a random wandering path, you’re going to have to work hard to identify each point individually—there are no symmetry relationships that allow you to map known points to unknown points.

Sets of numbers can have symmetry, too, and the more symmetry a set has, the easier it is to understand—you can apply symmetry relationships to discover unknown values. Numbers that have particular kinds of symmetry relationships form a “group,” and mathematicians can use the properties of a group to understand all the numbers it contains.

The set of rational solutions to an equation doesn’t have any symmetry and doesn’t form a group, which leaves mathematicians with the impossible task of trying to discover the solutions one at a time.

Beginning in the 1940s, mathematicians began to explore ways of situating Diophantine equations in settings with more symmetry. The mathematician Claude Chabauty discovered that inside a larger geometric space he constructed (using an expanded universe of numbers called the p-adic numbers), the rational numbers form their own symmetric subspace. He then took this subspace and combined it with the graph of a Diophantine equation. The points where the two intersect reveal rational solutions to the equation.

In the 1980s the mathematician Robert Coleman refined Chabauty’s work. For a couple of decades after that, the Coleman-Chabauty approach was the best tool mathematicians had for finding rational solutions to Diophantine equations. It only works, though, when the graph of the equation is in a particular proportion to the size of the larger space. When the proportion is off, it becomes hard to spot the exact points where the curve of the equation intersects the rational numbers.

“If you have a curve inside an ambient space and there are too many rational points, then the rational points kind of cluster and you have trouble distinguishing which ones are on the curve,” said Kiran Kedlaya, a mathematician at the University of California, San Diego.

And that’s where Kim came in. To extend Chabauty’s work, he wanted to find an even larger space in which to think about Diophantine equations—a space where the rational points are more spread out, allowing him to study intersection points for many more kinds of Diophantine equations.

### Spaces of Spaces

If you’re looking for a larger kind of space, along with clues about how to use symmetry to navigate it, physics is a good place to turn.

Generally speaking, a “space,” in the mathematical sense, is any set of points that has geometric or topological structure. One thousand points scattered willy-nilly won’t form a space—there’s no structure that ties them together. But a sphere, which is just a particularly coherent arrangement of points, is a space. So is a torus, or the two-dimensional plane, or the four-dimensional space-time in which we live.

In addition to these spaces, there exist even more exotic spaces, which you can think of as “spaces of spaces.” To take a very simple example, imagine that you have a triangle—that’s a space. Now imagine the space of all possible triangles. Each point in this larger space represents a particular triangle, with the coordinates of the point given by the angles of the triangles it represents.

That sort of idea is often useful in physics. In the framework of general relativity, space and time are constantly evolving, and physicists think of each space-time configuration as a point in a space of all space-time configurations. Spaces of spaces also come up in an area of physics called gauge theory, which has to do with fields that physicists layer on top of physical space. These fields describe how forces like electromagnetism and gravity change as you move through space. You can imagine that there’s a slightly different configuration of these fields at every point in space—and that all those different configurations together form points in a higher-dimensional “space of all fields.”

This space of fields from physics is a close analogue to what Kim is proposing in number theory. To understand why, consider a beam of light. Physicists imagine the light moving through the higher-dimensional space of fields. In this space, light will follow the path that adheres to the “principle of least action”—that is, the path that minimizes the amount of time required to go from A to B. The principle explains why light bends when it moves from one material to another—the bent path is the one that minimizes the time taken.

These larger spaces of spaces that come up in physics feature additional symmetries that are not present in any of the spaces they represent. These symmetries draw attention to specific points, emphasizing, for example, the time-minimizing path. Constructed in another way in another context, these same kinds of symmetries might emphasize other kinds of points—like the points corresponding to rational solutions to equations.

### Connecting Symmetry to Physics

Number theory has no particles to track, but it does have something like space-time, and it also offers a way of drawing paths and constructing a space of all possible paths. From this basic correspondence, Kim is working out a scheme in which “the problem of finding the trajectory of light and that of finding rational solutions to Diophantine equations are two facets of the same problem,” as he explained last week at a conference on mathematical physics in Heidelberg, Germany.

The solutions to Diophantine equations form spaces—these are the curves defined by the equations. These curves can be one-dimensional, like the circle, or they can be higher-dimensional. For example, if you plot (complex) solutions to the Diophantine equation x^{4} + y^{4} = 1, you get the three-holed torus. The rational points on this torus lack geometric structure—that’s what makes them hard to find—but they can be made to correspond to points in a higher-dimensional space of spaces that do have structure.

Kim creates this higher-dimensional space of spaces by thinking about ways you can draw loops on the torus (or whatever space the equation defines). The loop-drawing procedure goes as follows. First, choose a base point, then draw a loop from that point to any other point and back again. Now repeat that process, drawing paths that connect your base point with every other point on the torus. You’ll end up with a thicket of all possible loops that begin and end at the base point. This collection of loops is a centrally important object in mathematics—it’s called the fundamental group of a space.

You can use any point on the torus as your base point. Each point will have a unique thicket of paths emanating from it. Each of these collections of paths can then be represented as a point in a higher-dimensional “space of all collections of paths” (like the space of all possible triangles). This space of spaces is geometrically very similar to the “space of spaces” physicists construct in gauge theory: The way collections of paths change as you move from one point to another on the torus strongly resembles the way fields change as you move from one point to another in real space. This space of spaces features additional symmetries not present on the torus itself. And while there is no symmetry between the rational points on the torus, if you go into the space of all collections of paths, you can find symmetries between the points associated to the rational points. You gain symmetries that were not visible before.

“A phrase I use sometimes is that there is a kind of ‘hidden arithmetic symmetry’ encoded in these paths that is highly analogous to the internal symmetries of gauge theory,” Kim said.

Just as Chabauty did, Kim finds rational solutions by thinking about intersection points in this larger space he’s constructed. He uses symmetries of this space to narrow in on the intersection points. His hope is to develop an equation that detects these points exactly.

In the physics setting, you can imagine all possible paths that a ray of light could take. This is your “space of all paths.” The points in that space that interest physicists are the points corresponding to time-minimizing paths. Kim believes the points corresponding to thickets of paths emanating from rational points have something of this same quality — that is, the points minimize some property that comes up when you start to think about the geometric form of Diophantine equations. Only he hasn’t yet figured out what that property might be.

“What I started out trying to find” was a least-action principle for the mathematical setting, he wrote in an email. “I still don’t quite have it. But I am pretty confident it’s there.”

### An Uncertain Future

Over the past few months I’ve described Kim’s physics-inspired vision to several mathematicians, all admirers of Kim’s contributions to number theory. When presented with this take on his work, however, they didn’t know what to make of it.

“As a representative number theorist, if you showed me all the awesome stuff Minhyong has been doing and asked me if this was physically inspired, I’d say, ‘What the hell are you talking about?’” Ellenberg said.

So far, Kim has made no mention of physics in his papers. Instead, he’s written about objects called Selmer varieties, and he’s considered relationships between Selmer varieties in the space of all Selmer varieties. These are recognizable terms to number theorists. But to Kim, they’ve always been another name for certain kinds of objects in physics.

“It should be possible to use ideas from physicists to solve problems in number theory, but we haven’t thought carefully enough about how to set up such a framework,” Kim said. “We’re at a point where our understanding of physics is mature enough, and there are enough number theorists interested in it, to make a push.”

The primary obstacle to the development of Kim’s method lies in the search for some kind of action to minimize in the space of all thickets of loops. This kind of perspective comes naturally in the physical world, but it doesn’t make any obvious sense in arithmetic. Even mathematicians who follow Kim’s work closely wonder whether he’ll find it.

“I think [Kim’s program] is going to do a lot of great things for us. I don’t think we’re going to get as sharp an understanding as Minhyong wants where rational points are honestly classical solutions to some kind of arithmetic gauge theory,” said Arnav Tripathy, a professor of mathematical physics at Harvard University.

Today the language of physics remains almost entirely outside the practice of number theory. Kim thinks that’s almost certainly going to change. Forty years ago, physics and the study of geometry and topology had little to do with one another. Then, in the 1980s, a handful of mathematicians and physicists, all towering figures now, found exact ways to use physics to study the properties of shapes. The field has never looked back.

“It’s almost impossible to be interested in geometry and topology nowadays without knowing something about [physics]. I’m reasonably sure this will happen with number theory” in the next 15 years, Kim said. “The connections are so natural.”

_Original story reprinted with permission from Quanta Magazine, an editorially independent publication of the Simons Foundation whose mission is to enhance public understanding of science by covering research developments and trends in mathematics and the physical and life sciences.

### Series Introduction:

This will be a four-part series on China’s rapid technological growth in the past few years. Each part will focus on a different investment you could make today in order to get a piece of China’s booming technology sector.

### Tencent Overview:

If you spend any amount of time in Beijing or Shanghai, you’ll notice something interesting almost right away. No one is carrying cash or credit cards, and almost no one uses their cellphone number as their primary means of communication. Instead, they’re using an app called WeChat, which is similar to having Facebook (FB), PayPal (NASDAQ:PYPL), Skype, and text messaging all bundled together into one app. Tencent (OTCPK:TCEHY) (OTCPK:TCTZF) owns this application, which has over 950 million active users.

Tencent’s revenue growth has been astounding, and analysts expect that trend to continue into the future:

The reason for this massive growth is because Tencent owns people’s screen time in China. Whether you’re paying bills, playing a game, talking with friends, or hailing a taxi, you never have to leave Tencent’s world.

Speaking of games, Tencent also just happens to be the world’s leader in mobile gaming based on revenues. It’s currently ahead of Apple (AAPL), Microsoft (MSFT), Sony (SNE), King (KING), Electronic Arts (EA), Zynga (ZNGA), etc. What’s even more impressive is that despite being the top player in this area, it still grew its gaming revenue by 39% in the past year, and its market share in the space is continuing to increase.

Tencent has accomplished this dominance in the gaming sphere by partnering with a lot of the major players in the space to bring online versions of FIFA, Call of Duty, NBA 2K, and other extremely popular games to China.

Another interesting area where Tencent operates is streaming. Basketball is a perfect example of its foresight into this space. The popularity of the sport in China has exploded over the past decade, thanks in large part to Yao Ming. So what did Tencent do? It went out and struck a deal with the NBA to stream games in China. 65 million people watched the NBA finals last year from their phones in China through Tencent.

Besides gaming and streaming, Tencent’s other two major areas are social networks and advertising, which grew by 51% and 55% in the past year, respectively. Tencent is a $ 488 billion company that is still growing like a start-up. If you scroll back to the revenue chart above, you’ll see that the company’s revenue is expected to double by 2019.

Tencent’s social networks are particularly interesting to me. We’ve already discussed WeChat a little, but it has another app called QQ that has 850 million active users. Both QQ and WeChat together dominate China’s mobile payment space. Today, QQ and WeChat have over 300 million bank accounts linked to their mobile payment system.

As if all this wasn’t enough, QQ also has an application called QQMusic, which is considered to be the Spotify of China. This is an area where I anticipate Tencent will see a lot of growth moving forward.

### Growth Potential:

Tencent has numerous potential catalysts that could push the stock price higher, but there are a handful that I want to specifically point out that are quite promising.

The first is in the gaming space, specifically with e-sports. China has the world’s largest video game market, which is expected to generate about $ 27.5 billion in sales this year. This incredibly large video game market has spurred an immense interest in e-sports in China and other Asian countries. In fact, the Olympic Council of Asia recently announced that it would be including e-sports at the Asian Games in Hangzhou in 2022.

E-sports have grown so popular in Asia that a crowd of more than 40,000 people recently packed into a stadium to watch two of South Korea’s biggest gaming stars play each other head-to-head. Tencent has a stranglehold on this market. The company recently signed a deal with the city of Wuhu to build an e-sports university and a stadium for events.

Tao Junyin, the market director of a top e-sports content company recently said, “Tencent has a controlling power in the whole industry, so we have to find a way to work with Tencent. You either die or you go Tencent.” Tencent has a stranglehold on the e-sports market in Asia and will benefit tremendously from its rapid growth.

Another area where the company could see growth is the music streaming space. Tencent owns QQ music, KuGou, and Kuwo, which together make up over 75% of China’s music streaming market.

(Source)

Tencent has exclusive online distribution deals with Sony Music, Warner Music Group, and Universal Music Group. Its deals with the three largest music labels and dominance of market share put Tencent in a great position to control China’s music streaming market, which is relatively immature at the moment.

While China is the world’s most populous country, with over 1.3 billion people, it is only 12th in the world in terms of recorded music revenue. That’s up from 14th in 2015 according to the International Federation of Phonographic Industry (IFPI). This jump was largely due to the 30.6% growth in streaming and China’s 20.3% growth in music revenue, which was almost four times the 2016 global average of 5.9%.

Despite these impressive growth numbers, China’s music industry is still lagging behind the rest of the world. This gap won’t last forever, and as China begins to catch up with everyone else, Tencent stands to be the main beneficiary.

Finally, I just wanted to quickly point out that China’s mobile internet use is only expected to grow faster in the coming years, something that will clearly benefit Tencent.

(Source)

### Risks:

There are two main risks I want to point out before you invest your money into Tencent. The first is its valuation. After everything we just discussed, it should be no surprise that you’re going to have to pay a premium to get into this name. Tencent’s 51.69 P/E ratio currently reflects that.

Tencent has enjoyed a nice run-up over the past year, so some short to medium-term weakness certainly wouldn’t surprise me. If you plan on investing money that you may need within the next year, Tencent might not be the best investment for you. That being said, I’m a long-term investor, so some short to medium-term weakness would allow me to add to my current position at a cheaper price.

The second risk comes with investing in almost any Chinese company, and that’s the risk of regulation. Any regulations in China dealing with the internet could make life more difficult for Tencent and potentially limit its capabilities.

### Conclusion:

Tencent seems to be doing everything right. They are major players in almost every facet of China’s tech revolution, which is why some people expect Tencent to become the world’s biggest company by 2025.

If you want to own some of China’s technology revolution, Tencent is one of the best places to start. Stay tuned for Part 2 of this series coming in the next few days.

*Author’s note: If you would like to follow along with my China Series and other analysis, I would encourage you to hit the follow button next to my name at the top of the page. I enjoy interacting with my followers, so please comment below!*

**Disclosure:** I am/we are long TCEHY.

I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it (other than from Seeking Alpha). I have no business relationship with any company whose stock is mentioned in this article.

Editor’s Note: This article discusses one or more securities that do not trade on a major U.S. exchange. Please be aware of the risks associated with these stocks.

For fans of high-end TV, Ronald D. Moore might not quite rank alongside creators like *Mad* Men’s Matthew Wiener or *The Wire**‘s* David Simon – but he should. Moore was the mastermind behind 2004’s very serious, very good reboot of *Battlestar Galactica*, a series that arguably paved the way for everything from *The Walking Dead* to *Westworld* to, most obviously, *Game of Thrones*.

Now it looks like we’ll get a new space drama from Moore, thanks to Apple. *Deadline* reports that Apple has ordered an entire series to be created and written by Moore, along with two executive producers of the also-excellent *Fargo* TV series. *Engadget* reports that the series will “explore what would have happened if the space race between the United States, Soviet Russia, and the rest of the world hadn’t ended.”

*Get Data Sheet, Fortune’s technology newsletter.*

More important than the subject matter, the show’s pedigree suggests it will be full of deep characters, convoluted twists, and a fair bit of social commentary, putting it in the sweet spot for binge-worthy content that can attract broad attention as viewing habits shift from cable to streaming.

Apple has said it will spend $1 billion on original TV content, partly in response to a dramatic drop in iTunes’ share of online movie rentals in recent years. Apple’s first tentative steps into original programming, including the reality show Planet of the Apps, are included with an Apple Music membership, but Apple may also launch a new video service.

Sci-fi and fantasy series have been front and center in the streaming wars. So much so, in fact, that CBS recently anchored a big push for its All Access streaming service around a new Star Trek series – the franchise where Moore got his start.