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Posts tagged summation

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Q&A Complex functions and inner product $\langle \frac{\partial f}{\partial z} , g\rangle $

2 answers · posted 4mo ago by Richard‭ · last activity 4mo ago by Richard‭

Question complex-analysis summation integral functional-analysis

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Q&A Closed-form expression for sum of Modulo Arithmetic Progression

1 answer · posted 1y ago by theabbie‭ · edited 1y ago by trichoplax‭

Question formula summation sequence modular-arithmetic

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Q&A How can a 15 year old construe the LHS of Generalized Vandermonde's Identity, when it lacks summation limits and a summation index?

2 answers · posted 3y ago by DNB‭ · last activity 3y ago by r~~‭

Question summation

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Q&A How does the change of variable $\color{red}{r↦n−r}$ transmogrify $\sum\limits_{r=0}^n2^{n-r}\binom{n+r}{n}=2^{2n}$ into $\sum\limits_{k=0}^{n} \frac{\binom{2n-k}{n}}{2^{2n-k}}=1$?

1 answer · posted 3y ago by DNB‭ · edited 3y ago by Moshi‭

Question summation