Question

Maximal flow and minimal cut in complete graphs

score 924 · Answer 1 · 2014-05-09 23:35:31

924

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Maximal flow and minimal cut in complete graphs

Published on 09 May 2014 - 23:35

score 259 · Answer 2 · 2026-03-26 02:48:57

259

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Value of $x=\sum\limits_{n=1}^\infty {\frac{1}{10^n-1}} $ and location of second digit $1$ of $x$

Published on 26 Mar 2026 - 2:48

score 131 · Answer 3 · 2026-04-13 00:31:30

131

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Find the value of $\lim_{n\to \infty}\sum_{k=0}^n\frac{x^{2^k}}{1-x^{2^{k+1}}}$.

Published on 13 Apr 2026 - 0:31

score 171 · Answer 4 · 2014-05-10 12:46:59

171

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Find the sum : $\displaystyle\sum_{i=0}^n \frac{2^i}{1+x^{2^{i}}}$

Published on 10 May 2014 - 12:46

score 115 · Answer 5 · 2014-05-10 13:56:19

115

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Computing the sum $\sum_{n=2}^{2011}\sqrt{1+\frac{1}{n^2}+\frac{1}{(n-1)^2}}$

Published on 10 May 2014 - 13:56

score 55 · Answer 6 · 2014-05-11 01:44:49

How prove this $\sum_{i}r_{i}x^2_{i}+2\sum_{i<j}r_{i}x_{i}x_{j}=\sum_{i}(r_{i}-r_{i-1})\left( \sum_{j=i}^{n}x_{j}\right)^2$

score 144 · Answer 7 · 2026-04-10 16:15:41

144

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Interesting Base summation contest math problem

Published on 10 Apr 2026 - 16:15

score 107 · Answer 8 · 2026-04-11 17:48:52

107

Views

Why does a sum of a series belong to Calculus?

Published on 11 Apr 2026 - 17:48

score 391 · Answer 9 · 2026-04-12 06:24:52

391

Views

Summation in 104 Number Theory problems

Published on 12 Apr 2026 - 6:24

score 476 · Answer 10 · 2026-04-12 00:34:57

476

Views

A conjecture including binomial coefficients

Published on 12 Apr 2026 - 0:34

score 2.3k · Answer 11 · 2014-05-12 16:22:01

2.3k

Views

Summation Indices - How to interpret the zero index?

Published on 12 May 2014 - 16:22

score 24 · Answer 12 · 2026-04-12 01:22:33

24

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Summation inside a range

Published on 12 Apr 2026 - 1:22

score 1.8k · Answer 13 · 2026-04-12 01:46:39

1.8k

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Evaluating Combination Sum $\sum{n+k\choose 2k} 2^{n-k}$

Published on 12 Apr 2026 - 1:46

score 153 · Answer 14 · 2014-05-13 06:12:56

153

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Show that if $\sup\big\{\sum\lvert\, f(a)\rvert\big\} < \infty$, then $\{ a \in A : f(a) > 0\}$ is countable.

Published on 13 May 2014 - 6:12

score 213 · Answer 15 · 2026-04-04 09:26:26

213

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Do there exist $a_k$ and $b_k$ so the equation $\sum\limits_{k=1}^{n} (a_k \sin(kx) + b_k \cos(kx)) = 0$ has no roots?

Published on 04 Apr 2026 - 9:26

List Question

Maximal flow and minimal cut in complete graphs

Value of $x=\sum\limits_{n=1}^\infty {\frac{1}{10^n-1}} $ and location of second digit $1$ of $x$

Find the value of $\lim_{n\to \infty}\sum_{k=0}^n\frac{x^{2^k}}{1-x^{2^{k+1}}}$.

Find the sum : $\displaystyle\sum_{i=0}^n \frac{2^i}{1+x^{2^{i}}}$

Computing the sum $\sum_{n=2}^{2011}\sqrt{1+\frac{1}{n^2}+\frac{1}{(n-1)^2}}$

How prove this $\sum_{i}r_{i}x^2_{i}+2\sum_{i<j}r_{i}x_{i}x_{j}=\sum_{i}(r_{i}-r_{i-1})\left( \sum_{j=i}^{n}x_{j}\right)^2$

Interesting Base summation contest math problem

Why does a sum of a series belong to Calculus?

Summation in 104 Number Theory problems

A conjecture including binomial coefficients

Summation Indices - How to interpret the zero index?

Summation inside a range

Evaluating Combination Sum $\sum{n+k\choose 2k} 2^{n-k}$

Show that if $\sup\big\{\sum\lvert\, f(a)\rvert\big\} < \infty$, then $\{ a \in A : f(a) > 0\}$ is countable.

Do there exist $a_k$ and $b_k$ so the equation $\sum\limits_{k=1}^{n} (a_k \sin(kx) + b_k \cos(kx)) = 0$ has no roots?

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