Question

Cardinality of the power set of natural numbers

score 2.5k · Answer 1 · 2012-02-27 15:30:21

2.5k

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Cardinality of the power set of natural numbers

Published on 27 Feb 2012 - 15:30

score 7.5k · Answer 2 · 2012-03-27 19:49:57

7.5k

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Why not to extend the set of natural numbers to make it closed under division by zero?

Published on 27 Mar 2012 - 19:49

score 155 · Answer 3 · 2012-03-28 22:06:16

155

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Prove that $\mathbb{N}$ is nonwhere dense in $\mathbb{R}$

Published on 28 Mar 2012 - 22:06

score 6.9k · Answer 4 · 2012-03-29 07:44:42

6.9k

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Proof that binomial coefficient is a natural number

Published on 29 Mar 2012 - 7:44

score 5.2k · Answer 5 · 2026-03-29 03:45:09

5.2k

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Why do we take the axiom of induction for natural numbers (Peano arithmetic)?

Published on 29 Mar 2026 - 3:45

score 1.9k · Answer 6 · 2012-05-24 13:53:43

1.9k

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Perfect square with digit-sum 15

Published on 24 May 2012 - 13:53

score 2.1k · Answer 7 · 2026-03-27 10:46:19

2.1k

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How can we produce another geek clock with a different pair of numbers?

Published on 27 Mar 2026 - 10:46

score 1k · Answer 8 · 2012-08-03 01:44:02

1k

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Euler's theorem for powers of 2

Published on 03 Aug 2012 - 1:44

score 5.2k · Answer 9 · 2012-08-13 00:52:31

5.2k

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Proof that $1$ is the least natural number using the Principle of Well Ordering

Published on 13 Aug 2012 - 0:52

score 312 · Answer 10 · 2012-08-23 16:26:36

312

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Prove that $\left (\frac{a^2 + b^2 +c^2}{a+b+c} \right) ^ {(a+b+c)} > a^a b^b c^c$

Published on 23 Aug 2012 - 16:26

score 4.3k · Answer 11 · 2026-03-28 14:27:20

4.3k

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Consistency of Peano axioms (Hilbert's second problem)?

Published on 28 Mar 2026 - 14:27

score 928 · Answer 12 · 2012-09-12 09:31:50

928

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Interesting or non-obvious finite subsets of the natural numbers

Published on 12 Sep 2012 - 9:31

score 1.6k · Answer 13 · 2012-09-12 10:06:28

1.6k

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How to define a bijection between natural numbers and the set of all polynomials with natural coefficients and finite variables?

Published on 12 Sep 2012 - 10:06

score 2.1k · Answer 14 · 2012-09-13 11:12:51

2.1k

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Of all the possible combinations of positive numbers that sum to 10, which has the largest multiplication?

Published on 13 Sep 2012 - 11:12

score 89 · Answer 15 · 2012-09-13 15:44:21

89

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Estimation of a polynomial

Published on 13 Sep 2012 - 15:44

List Question

Cardinality of the power set of natural numbers

Why not to extend the set of natural numbers to make it closed under division by zero?

Prove that $\mathbb{N}$ is nonwhere dense in $\mathbb{R}$

Proof that binomial coefficient is a natural number

Why do we take the axiom of induction for natural numbers (Peano arithmetic)?

Perfect square with digit-sum 15

How can we produce another geek clock with a different pair of numbers?

Euler's theorem for powers of 2

Proof that $1$ is the least natural number using the Principle of Well Ordering

Prove that $\left (\frac{a^2 + b^2 +c^2}{a+b+c} \right) ^ {(a+b+c)} > a^a b^b c^c$

Consistency of Peano axioms (Hilbert's second problem)?

Interesting or non-obvious finite subsets of the natural numbers

How to define a bijection between natural numbers and the set of all polynomials with natural coefficients and finite variables?

Of all the possible combinations of positive numbers that sum to 10, which has the largest multiplication?

Estimation of a polynomial

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