"라마누잔의 class invariants"의 두 판 사이의 차이
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+ | <h5 style="line-height: 2em; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;">special values</h5> | ||
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+ | <math>G_{25}=\frac{\sqrt{5}+1}{2}</math> | ||
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+ | <math>g_{10}=\sqrt{\frac{\sqrt{5}+1}{2}}</math> | ||
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* [[베버(Weber) 모듈라 함수]]<br>[[베버(Weber) 모듈라 함수|]]<br><math>f(\tau)=\frac{e^{-\frac{\pi i}{24}}\eta(\frac{\tau+1}{2})}{\eta(\tau)}=q^{-1/48} \prod_{n=1}^{\infty} (1+q^{n-\frac{1}{2}})</math><br><math>f_1(\tau)=\frac{\eta(\frac{\tau}{2})}{\eta(\tau)}=q^{-1/48} \prod_{n=1}^{\infty} (1-q^{n-\frac{1}{2}})</math><br><math>f_2(\tau)=\sqrt{2}\frac{\eta(2\tau)}{\eta(\tau)}=\sqrt{2}q^{1/24} \prod_{n=1}^{\infty} (1+q^{n})</math><br> | * [[베버(Weber) 모듈라 함수]]<br>[[베버(Weber) 모듈라 함수|]]<br><math>f(\tau)=\frac{e^{-\frac{\pi i}{24}}\eta(\frac{\tau+1}{2})}{\eta(\tau)}=q^{-1/48} \prod_{n=1}^{\infty} (1+q^{n-\frac{1}{2}})</math><br><math>f_1(\tau)=\frac{\eta(\frac{\tau}{2})}{\eta(\tau)}=q^{-1/48} \prod_{n=1}^{\infty} (1-q^{n-\frac{1}{2}})</math><br><math>f_2(\tau)=\sqrt{2}\frac{\eta(2\tau)}{\eta(\tau)}=\sqrt{2}q^{1/24} \prod_{n=1}^{\infty} (1+q^{n})</math><br> | ||
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2009년 10월 24일 (토) 14:16 판
이 항목의 스프링노트 원문주소
간단한 소개
- 라마누잔이 많은 계산 결과를 남겨놓은 분야
- class field theory에서 중요한 역할을 함
\(G_n:=(2kk')^{-1/12}=2^{-1/4}f(\sqrt{-n})\)
\(g_n:=(\frac{k'(\sqrt{-n})^2}{2k(\sqrt{-n})})^{1/12}=2^{-1/4}f_1(\sqrt{-n})\)
special values
\(G_{25}=\frac{\sqrt{5}+1}{2}\)
\(g_{10}=\sqrt{\frac{\sqrt{5}+1}{2}}\)
\(g_{58}^2=\frac{\sqrt{29}+5}{2}\)
정의
\(q=e^{2\pi i \tau}\)
- 자코비 세타함수[[자코비 세타함수|]]\(\theta_{2}(\tau)= \sum_{n=-\infty}^\infty q^{(n+\frac{1}{2})^2/2}\)
\(\theta_3(\tau)=\sum_{n=-\infty}^\infty q^{n^2/2}\)
\(\theta_{4}(\tau)= \sum_{n=-\infty}^\infty (-1)^n q^{n^2/2}\) - 모듈라 군, j-invariant and the singular moduli
[[모듈라 군, j-invariant and the singular moduli|]]
\(k=k(\tau)=\frac{\theta_2^2(\tau)}{\theta_3^2(\tau)}\)
\(k'=\sqrt{1-k^2}=\frac{\theta_4^2(\tau)}{\theta_3^2(\tau)}\)
- 데데킨트 에타함수
\(\eta(\tau) = q^{1/24} \prod_{n=1}^{\infty} (1-q^{n})\)
- 베버(Weber) 모듈라 함수
[[베버(Weber) 모듈라 함수|]]
\(f(\tau)=\frac{e^{-\frac{\pi i}{24}}\eta(\frac{\tau+1}{2})}{\eta(\tau)}=q^{-1/48} \prod_{n=1}^{\infty} (1+q^{n-\frac{1}{2}})\)
\(f_1(\tau)=\frac{\eta(\frac{\tau}{2})}{\eta(\tau)}=q^{-1/48} \prod_{n=1}^{\infty} (1-q^{n-\frac{1}{2}})\)
\(f_2(\tau)=\sqrt{2}\frac{\eta(2\tau)}{\eta(\tau)}=\sqrt{2}q^{1/24} \prod_{n=1}^{\infty} (1+q^{n})\)
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사전형태의 참고자료
- http://ko.wikipedia.org/wiki/
- http://en.wikipedia.org/wiki/
- http://scholar.google.com/scholar?q=ramanujan%27s+class+invariants&hl=ko&lr=&start=10&sa=N
- http://front.math.ucdavis.edu/search?a=&t=&c=&n=40&s=Listings&q=
- 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=
관련도서 및 추천도서
- Ramanujan's Notebooks: V
- Bruce C. Berndt
- 도서내검색
- 도서검색
관련논문과 에세이
- Ramanujan's Most Singular Modulus
- Mark B. Villarino, Arxiv, 2003-8
- Ramanujan and the modular j-invariant
- BC Berndt, HH Chan, Canadian Mathematical Bulletin, 1999
- RAMANUJAN–WEBER CLASS INVARIANT Gn AND WATSON'S EMPIRICAL PROCESS
- Heng Huat Chan, Journal of the London Mathematical Society, 1998
- Ramanujan's Class Invariants With Applications To The Values Of q-Continued Fractions And Theta-Functions
- Bruce C. Berndt , Heng Huat Chan , Liang-Cheng Zhang, 1997
- Ramanujan's class invariants, Kronecker's limit formula, and modular equations
- Bruce C. Berndt , Heng Huat Chan , Liang-Cheng Zhang Transactions of the American Mathematical Society, 1997
- Ramanujan’s class invariants and cubic continued fraction
- Bruce C. Berndt , Heng Huat Chan , Liang-Cheng Zhang, ACTA ARITHMETICA LXXIII.1 (1995)
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