List questions from problem-solving

Published on 23 May 2014 - 7:35

78

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Proof Verification: If 650 points in a circle of radius 16, prove that some 10 must lie in a ring of inner radius 2 and outer radius 3.

Published on 24 May 2014 - 20:52

52

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How does $2N_{h-2}$ become $2^{h/2}$?

Published on 25 May 2014 - 21:33

173

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Trying to use the deformation theorem to solve integral

Published on 26 May 2014 - 19:00

940

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Using Poisson's integral formula

Published on 26 May 2014 - 22:15

403

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Find the Laurent series of $\sin z/z^2$ using Laurent's theorem

Published on 27 Mar 2026 - 13:25

247

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Values of $a$ s.t. for all continuous $f$ with $f(0)=f(1)$ there exists $x$ s.t. $f(x+a) = f(x)$

Published on 28 May 2014 - 11:16

43

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How do I prove this statement?

Published on 28 May 2014 - 20:55

389

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Prove solution does not exist for inequalities system

Published on 27 Mar 2026 - 16:46

51

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Find Laurent's series of these two functions around $z_o$

Published on 27 Mar 2026 - 13:25

228

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A 20 × 20 × 20 cube is built of 1 × 2 × 2 bricks. Prove that one can pierce it by a needle without piercing a brick.

Published on 30 May 2014 - 1:52

428

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Residue of the function $\frac{\sin (2z)-2z}{(1-\cos z)^2}$ for $z_0=0$.

Published on 27 Mar 2026 - 14:55

3.9k

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How to solve 2 ÷ 2 ÷ 2 ? ${}{}{}{}$

Published on 31 May 2014 - 7:59

3.8k

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Basic combinatorics question

Published on 02 Jun 2014 - 10:07

List Question

Solve this equation. Can anybody do it?

Proof Verification: If 650 points in a circle of radius 16, prove that some 10 must lie in a ring of inner radius 2 and outer radius 3.

How does $2N_{h-2}$ become $2^{h/2}$?

Trying to use the deformation theorem to solve integral

Using Poisson's integral formula

More problems like Engel's Problem Solving

Find the Laurent series of $\sin z/z^2$ using Laurent's theorem

Values of $a$ s.t. for all continuous $f$ with $f(0)=f(1)$ there exists $x$ s.t. $f(x+a) = f(x)$

How do I prove this statement?

Prove solution does not exist for inequalities system

Find Laurent's series of these two functions around $z_o$

A 20 × 20 × 20 cube is built of 1 × 2 × 2 bricks. Prove that one can pierce it by a needle without piercing a brick.

Residue of the function $\frac{\sin (2z)-2z}{(1-\cos z)^2}$ for $z_0=0$.

How to solve 2 ÷ 2 ÷ 2 ? ${}{}{}{}$

Basic combinatorics question

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