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A closed form for the sum $\sum_{s=0}^{n-1} e^{\frac{s(s+1)}{2}i\theta}$?

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#complex-numbers #summation #fractals
111
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Variance inequality of identically distributed random variables

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#probability #summation #random-variables
86
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A share price grows $1+\epsilon$ times with prob. $p$ or falls $1-\epsilon$ times with prob. $1-p$ each day, what's its expected value after $n$ days?

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#probability #summation #random-variables #binomial-distribution
309
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Summing Odd Fractions to One

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#summation #fractions
67
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Limit value using serie definition

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#limits #summation #power-series
74
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Proof $n \geq 3\hspace{0.5cm} \sum\limits_{k=1}^{n-2}{n-k\choose 2}={n\choose 3}$

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#summation #proof-writing #induction #binomial-coefficients
173
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How to prove that $e^k > k$?

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#calculus #real-analysis #sequences-and-series #proof-verification #summation
6.4k
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Absolute value of a summation?

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#summation #absolute-value
52
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How to obtain the right-hand side of the following equation?

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#sequences-and-series #number-theory #summation
76
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Problem in finding the value of this limit

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#sequences-and-series #limits #definite-integrals #summation
25
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How did these equations go from Step 2 to Step 3?

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#statistics #summation
31
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Summation Simplication

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#summation
113
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Understanding summation formulas

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#summation #computational-complexity #constants
166
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Evaluate $\lim_{ n \to \infty} \sum_{r=2n+1}^{3n} \frac{n}{r^2-n^2}$

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#integration #sequences-and-series #algebra-precalculus #definite-integrals #summation
69
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Generic formula for the power of a finite sum (aka distributive law)?

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#algebra-precalculus #summation

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