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A pedagogical proof that 9's can be ignored when calculating digital roots

score 2.3k · Answer 1 · 2026-04-01 19:23:24

2.3k

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A pedagogical proof that 9's can be ignored when calculating digital roots

Published on 01 Apr 2026 - 19:23

score 388 · Answer 2 · 2015-04-08 20:38:46

388

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Where can I find Wielandt's original proof of Sylow's Theorem?

Published on 08 Apr 2015 - 20:38

score 933 · Answer 3 · 2015-04-10 19:37:28

933

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$\mathbb{Z}[\sqrt{2}]/(3-\sqrt{2})$ is ring isomorphic to $\mathbb{Z}_n$.

Published on 10 Apr 2015 - 19:37

score 467 · Answer 4 · 2015-04-12 23:43:47

467

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Proving associativity of symmetric set difference

Published on 12 Apr 2015 - 23:43

score 7.9k · Answer 5 · 2015-04-17 04:12:40

7.9k

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A freshman's dream

Published on 17 Apr 2015 - 4:12

score 407 · Answer 6 · 2015-04-17 10:02:55

407

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Can I find $\sum_{k=1}^n\frac{1}{k(k+1)}$ without using telescoping series method?

Published on 17 Apr 2015 - 10:02

score 1k · Answer 7 · 2015-04-18 06:13:45

1k

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Dijkstra's Algorithm for Negative Weights.

Published on 18 Apr 2015 - 6:13

score 904 · Answer 8 · 2015-04-20 04:23:02

904

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Product Spaces: Tube Lemma

Published on 20 Apr 2015 - 4:23

score 208 · Answer 9 · 2015-04-22 15:29:16

208

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If $\sum\limits_{n=1}^\infty a_n $ is convergent with $a_n$ positive, then $\sum\limits_{n=1}^\infty \frac {{(a_n)}^{1/2}}{n}$ is also convergent

Published on 22 Apr 2015 - 15:29

score 36.1k · Answer 10 · 2015-04-23 03:06:34

36.1k

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Prove that there is no smallest positive real number

Published on 23 Apr 2015 - 3:06

score 907 · Answer 11 · 2015-04-30 11:28:22

907

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To proof the difference images is a subset of their map difference sets

Published on 30 Apr 2015 - 11:28

score 80 · Answer 12 · 2026-04-06 09:55:53

80

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Is the solution of functional equation $x^x=y^y$ when $0\lt x\lt y$ uncountable?

Published on 06 Apr 2026 - 9:55

score 403 · Answer 13 · 2015-04-30 17:56:33

403

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Show $f(x)$ is bounded in a neighbourhood of its limit points

Published on 30 Apr 2015 - 17:56

score 1.3k · Answer 14 · 2026-04-02 04:55:17

1.3k

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On a connection between Newton's binomial theorem and general Leibniz rule using a new method.

Published on 02 Apr 2026 - 4:55

score 57 · Answer 15 · 2015-04-30 22:20:43

57

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Let $p\gt 3$ be a prime number and: $\sum_{j=1}^{p-1}\frac{(-1)^{j}}{j} \binom{p-1}{j} =\frac{a}{b}\Rightarrow p^2\mid a$

Published on 30 Apr 2015 - 22:20

List Question

A pedagogical proof that 9's can be ignored when calculating digital roots

Where can I find Wielandt's original proof of Sylow's Theorem?

$\mathbb{Z}[\sqrt{2}]/(3-\sqrt{2})$ is ring isomorphic to $\mathbb{Z}_n$.

Proving associativity of symmetric set difference

A freshman's dream

Can I find $\sum_{k=1}^n\frac{1}{k(k+1)}$ without using telescoping series method?

Dijkstra's Algorithm for Negative Weights.

Product Spaces: Tube Lemma

If $\sum\limits_{n=1}^\infty a_n $ is convergent with $a_n$ positive, then $\sum\limits_{n=1}^\infty \frac {{(a_n)}^{1/2}}{n}$ is also convergent

Prove that there is no smallest positive real number

To proof the difference images is a subset of their map difference sets

Is the solution of functional equation $x^x=y^y$ when $0\lt x\lt y$ uncountable?

Show $f(x)$ is bounded in a neighbourhood of its limit points

On a connection between Newton's binomial theorem and general Leibniz rule using a new method.

Let $p\gt 3$ be a prime number and: $\sum_{j=1}^{p-1}\frac{(-1)^{j}}{j} \binom{p-1}{j} =\frac{a}{b}\Rightarrow p^2\mid a$

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