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Journal of the American Mathematical Society
Journal of the American Mathematical Society
ISSN 1088-6834(online) ISSN 0894-0347(print)


Euler's ``exemplum memorabile inductionis fallacis'' and $ q$-trinomial coefficients

Author: George E. Andrews
Journal: J. Amer. Math. Soc. 3 (1990), 653-669
MSC: Primary 05A10; Secondary 05A30, 11B65
MathSciNet review: 1040390
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Abstract: The trinomial coefficients are defined centrally by $ \Sigma _{j = - m}^\infty {(_j^m)_2}{x^j} = {(1 + x + {x^{ - 1}})^m}$. Euler observed that for $ - 1 \leq m \leq 7$, $ 3{(_{\,\;0}^{m + 1})_2} - {(_{\,\;0}^{m + 2})_2} = {F_m}({F_m} + 1)$, where $ {F_m}$ is the $ m$th Fibonacci number. The assertion is false for $ m > 7$. We prove general identities--one of which reduces to Euler's assertion for $ m \leq 7$. Our main object is to analyze $ q$-analogs extending Euler's observation. Among other things we are led to finite versions of dissections of the Rogers-Ramanujan identities into even and odd parts.

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PII: S 0894-0347(1990)1040390-4
Article copyright: © Copyright 1990 American Mathematical Society

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