"Finite dimensional representations of Sl(2)"의 두 판 사이의 차이

수학노트
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<h5>introduction</h5>
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==introduction==
  
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* http://qchu.wordpress.com/2010/03/07/walks-on-graphs-and-tensor-products/
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* [[affine sl(2)]]
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* http://mathoverflow.net/questions/17197/how-does-this-relationship-between-the-catalan-numbers-and-su2-generalize
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* [[quantum sl(2)]]
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<h5>character formula</h5>
 
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*  Weyl-Kac formula<br><math>ch(V)={\sum_{w\in W} (-1)^{\ell(w)}w(e^{\lambda+\rho}) \over e^{\rho}\prod_{\alpha>0}(1-e^{-\alpha})}</math><br>
 
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*  for trivial representation, we get denominator identity<br><math>{\sum_{w\in W} (-1)^{\ell(w)}w(e^{\rho}) = e^{\rho}\prod_{\alpha>0}(1-e^{-\alpha})^{m_{\alpha}}}</math><br>
 
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<h5 style="line-height: 2em; margin: 0px;">specialization</h5>
 
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*  Cartan matrix<br><math>\mathbf{A} = \begin{pmatrix} 2 \end{pmatrix}</math><br>
 
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*  root system<br><math>\Phi=\{\alpha,-\alpha\}</math><br>
 
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*  integrable weights and Weyl vector<br><math>\omega=\frac{1}{2}\alpha</math><br><math>\rho=\omega</math><br> integrable weights <math>\lambda=n\omega</math><br>
 
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*  Weyl-Kac formula<br><math>\operatorname{ch}L(n\omega)=\frac{e^{(n+1)\omega}-e^{-(n+1)\omega}}{e^{\omega}-e^{-\omega}}=e^{n\omega}+e^{(n-2)\omega}+\cdots+e^{-n\omega}</math><br>
 
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<h5 style="line-height: 2em; margin: 0px;">Chebyshev polynomial of the 2nd kind</h5>
 
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* <math>U_{n+1}(x) & = 2xU_n(x) - U_{n-1}(x)</math><br> U_0[x]=1<br> U_1[x]=2 x<br> U_2[x]=-1+4 x^2<br> U_3[x]=-4 x+8 x^3<br>
 
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* character evaluated at an element of SU(2) with the eigenvalues e^{i\theta}, e^{-i\theta} is given by the Chebyshev polynomials<br><math>U_n(\cos\theta)= \frac{\sin (n+1)\theta}{\sin \theta}</math><br>
 
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* <math>w=e^{i\theta}</math>, <math>z=w+w^{-1}=2\cos\theta</math><br><math>p_i(z)=\frac{w^{i+1}-w^{-i-1}}{w-w^{-1}}</math><br><math>p_{0}(z)=1</math><br><math>p_{1}(z)=z</math><br><math>p_{2}(z)=z^2-1</math><br><math>p_{3}(z)=z^3-2z</math><br><math>p_i(z)^2=1+p_{i-1}(z)p_{i+1}(z)</math><br>
 
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<h5>Hermite reciprocity</h5>
 
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<h5>Catalan numbers</h5>
 
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# f[n_] := Integrate[(2 Cos[Pi*x])^n*2 (Sin[Pi*x])^2, {x, 0, 1}]<br> Table[Simplify[f[2 k]], {k, 1, 10}]<br> Table[CatalanNumber[n], {n, 1, 10}]
 
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<h5>history</h5>
 
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* http://www.google.com/search?hl=en&tbs=tl:1&q=
 
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<h5>related items</h5>
 
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* [[cyclotomic numbers and Chebyshev polynomials]]
 
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* [[Weyl-Kac character formula]]
 
 
* [[Macdonald constant term conjecture]]
 
* [[Macdonald constant term conjecture]]
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* {{수학노트|url=리대수 sl(2,C)의 유한차원 표현론}}
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==Catalan numbers==
  
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* http://qchu.wordpress.com/2010/03/07/walks-on-graphs-and-tensor-products/
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* http://mathoverflow.net/questions/17197/how-does-this-relationship-between-the-catalan-numbers-and-su2-generalize
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<h5 style="line-height: 3.428em; margin: 0px; color: rgb(34, 61, 103);">encyclopedia</h5>
 
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* [http://pythagoras0.springnote.com/pages/4682477 체비셰프 다항식]
 
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* http://en.wikipedia.org/wiki/
 
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* http://www.scholarpedia.org/
 
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* Princeton companion to mathematics([[2910610/attachments/2250873|Companion_to_Mathematics.pdf]])
 
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<h5>books</h5>
 
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* [[2010년 books and articles]]<br>
 
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* http://gigapedia.info/1/
 
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* http://gigapedia.info/1/
 
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* http://www.amazon.com/s/ref=nb_ss_gw?url=search-alias%3Dstripbooks&field-keywords=
 
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<h5 style="line-height: 3.428em; margin: 0px; color: rgb(34, 61, 103);">articles</h5>
 
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[[2010년 books and articles|]]
 
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* [http://dx.doi.org/10.1063/1.527759 SL(2,C), SU(2), and Chebyshev polynomials]<br>
 
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** Henri Bacry, J. Math. Phys. 28, 2259 (1987)
 
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* http://www.ams.org/mathscinet
 
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* http://www.zentralblatt-math.org/zmath/en/
 
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* http://pythagoras0.springnote.com/
 
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* [http://math.berkeley.edu/%7Ereb/papers/index.html http://math.berkeley.edu/~reb/papers/index.html]
 
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* http://front.math.ucdavis.edu/search?a=&t=&c=&n=40&s=Listings&q=
 
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* http://www.ams.org/mathscinet/search/publications.html?pg4=AUCN&s4=&co4=AND&pg5=TI&s5=&co5=AND&pg6=PC&s6=&co6=AND&pg7=ALLF&co7=AND&Submit=Search&dr=all&yrop=eq&arg3=&yearRangeFirst=&yearRangeSecond=&pg8=ET&s8=All&s7=
 
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* http://dx.doi.org/10.1063/1.527759
 
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<h5>question and answers(Math Overflow)</h5>
 
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* http://mathoverflow.net/search?q=
 
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* http://mathoverflow.net/search?q=
 
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<h5>blogs</h5>
 
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*  구글 블로그 검색<br>
 
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** http://blogsearch.google.com/blogsearch?q=
 
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** http://blogsearch.google.com/blogsearch?q=
 
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<h5>experts on the field</h5>
 
  
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* http://arxiv.org/
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# f[n_] := Integrate[(2 Cos[Pi*x])^n*2 (Sin[Pi*x])^2, {x, 0, 1}]Table[Simplify[f[2 k]], {k, 1, 10}]Table[CatalanNumber[n], {n, 1, 10}]
  
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<h5>links</h5>
 
  
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* [http://detexify.kirelabs.org/classify.html Detexify2 - LaTeX symbol classifier]
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[[분류:개인노트]]
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* [http://pythagoras0.springnote.com/pages/1947378 수식표 현 안내]
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[[분류:math and physics]]
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* [http://www.research.att.com/%7Enjas/sequences/index.html The On-Line Encyclopedia of Integer Sequences]
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[[분류:Lie theory]]
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* http://functions.wolfram.com/
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[[분류:migrate]]

2020년 12월 28일 (월) 04:21 기준 최신판

introduction


Catalan numbers

  1. f[n_] := Integrate[(2 Cos[Pi*x])^n*2 (Sin[Pi*x])^2, {x, 0, 1}]Table[Simplify[f[2 k]], {k, 1, 10}]Table[CatalanNumber[n], {n, 1, 10}]
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