Why Are There No Triple Affine Hecke Algebras?

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How is every affine set convex?

I have a very basic question. A set is affine if [math]\sum w_i x_i[/math] also lies in set A. ([math]\sum w_i = 1[/math]) A set is convex if [math]\sum w_i x_i[/math] also lies in set C ([math]\sum w_i = 1, w_i \geq 0[/math]) Then how is every affine...

Answer:

Very intuitively, an Affine set contains a line through any two distinct points in the set. This means...

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Billy Okal at Quora Mark as irrelevant Undo

What role do Lie groups and/or Lie algebras play in physics?

A group is a set together with an associative law of composition that contains the identity and inverses. I can understand the basic definitions of Lie groups and Lie algebras. Lie algebras are apparently used to study Lie groups. I'd like to know what...

Answer:

Lie algebras describe continuous symmetries in infinitesimal form--- so if you have a geometrical continuous...

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Ron Maimon at Quora Mark as irrelevant Undo

Give an explicit formula for the affine map θ : R → R . . .?

Give an explicit formula for the affine map θ : R → R carrying [ S1 , S2 ]→ [t1 , t2] with θ(Si) = ti , i=1,2 . In particular, give a formula for the affine map taking [32,212] on to [0,100]. (Hint: θ(x) = λx +x0).

Answer:

To map [32, 212] onto [0, 100], use Theta(x) = [(100-0)/(212-32)][x-32], or Theta(x)=5/9(x-32). As you...

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mojir k at Yahoo! Answers Mark as irrelevant Undo

Computer Vision: Where can I find a sift feature implementation which uses  affine detectors and outputs the position, scale, orientation and descriptor of the features?

Surprisingly: VLfeat does not implement affine detectors. I don't intend to use an hack and slash method - Use oxford affine detectors followed by VLFeat sift to find orientations. VLFeat may multiple response for each frame. Now find out the mapping...

Answer:

Check this out: Affine Covariant Region Detectors http://www.robots.ox.ac.uk/~vgg/...

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Ankur Gupta at Quora Mark as irrelevant Undo

In differential geometry, what are "dual affine connections"?

What makes one affine connection "dual" to another?  In what sense is dual being used here? About the E&M algorithm: "In information geometry, the E step and the M step are interpreted as projections under dual affine connections"...

Answer:

Let M be a manifold.  [math] \nabla [/math] and [math] \nabla^\ast [/math] are dual with respect to...

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Hamilton Chong at Quora Mark as irrelevant Undo

How can forks algebras be described in layman's terms?

Related How can Lie algebras be described in layman's terms? http://en.wikipedia.org/wiki/Alg...

Answer:

There's no such thing as a "forks algebra."  The dining philosopher problem has a group of...

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Daniel McLaury at Quora Mark as irrelevant Undo

Why are there only four division algebras?

i am aware that the real numbers, the complexes, quaternions and octonions are the only division algebras that exist. As John Graves wrote to Hamilton: “If with your alchemy you can make three pounds of gold (complexes),why should you stop...

Answer:

First of all, there are infinitely many division algebras.  For example, any field is a division algebra...

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Daniel McLaury at Quora Mark as irrelevant Undo

Why did the paper "Generators of matrix algebras in dimension 2 and 3" take 11 years to be published after being submitted?

Aslaksen, Helmer, and Arne B. Sletsjøe. "Generators of matrix algebras in dimension 2 and 3." Linear Algebra and its Applications 430.1 (2009): 1-6. (follow-up of What was the paper that took many years to get published?)

Answer:

My father is a colleague of the authors, so I got in touch with Helmer Aslaksen through him. He pointed...

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Torkil Vederhus at Quora Mark as irrelevant Undo

What is an intuitive explanation of Kac-Moody algebras?

Especially in relation to Lie algebras

Answer:

Well, you have the theory of Coxeter groups that can be defined in two following ways (see Reflection...

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Mathieu Dutour Sikiric at Quora Mark as irrelevant Undo

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