List questions from natural-numbers

Published on 26 Mar 2026 - 12:58

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Proof related to natural numbers

Published on 22 Sep 2019 - 0:40

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With an option to reduce any pair satisfying a relation, repeatedly reduce a collection.

Published on 22 Sep 2019 - 12:20

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Does this completed metric space form a semi-ring?

Published on 25 Mar 2026 - 11:12

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Divisibility of a statement without the induction principle

Published on 25 Mar 2026 - 17:34

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Where's the error in this "proof"?

Published on 24 Sep 2019 - 7:53

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Problems about $\sin(n)$ where $n$ is an integer $\in (0,1000]$

Published on 25 Sep 2019 - 10:25

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Given a natural numbers $n$. Prove that $\left(\frac{\sum_{k=1}^{n}x_{k}}{n}\right)^{\sum\limits_{k=1}^{n}x_{k}}\leqq\prod_{k=1}^{n}x_{k}^{x_{k}}$ .

Published on 25 Mar 2026 - 11:21

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Cryptography puzzle found on a website. Solutions to$a^2 + b^2 + c^2 + d^2 + e^2 = 2011^{2019} $

Published on 26 Mar 2026 - 19:05

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For what values of $a$ does $b\in\mathbb{N}$?

Published on 30 Sep 2019 - 15:18

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The best symbol for non-negative integers?

Published on 12 Mar 2014 - 18:36

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Is this a correct definition of the natural numbers in ZF?

Published on 15 Mar 2014 - 21:03

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Turn formula with remainder

Published on 20 Mar 2014 - 11:13

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Can the natural number have an uncountable set of subsets?

Published on 24 Mar 2014 - 6:41

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How do I show that the set of odd natural numbers is closed under the operation * defined by a*b=a+b+ab?

Published on 25 Mar 2014 - 2:34

List Question

When a set of natural numbers has density 1?

Proof related to natural numbers

With an option to reduce any pair satisfying a relation, repeatedly reduce a collection.

Does this completed metric space form a semi-ring?

Divisibility of a statement without the induction principle

Where's the error in this "proof"?

Problems about $\sin(n)$ where $n$ is an integer $\in (0,1000]$

Given a natural numbers $n$. Prove that $\left(\frac{\sum_{k=1}^{n}x_{k}}{n}\right)^{\sum\limits_{k=1}^{n}x_{k}}\leqq\prod_{k=1}^{n}x_{k}^{x_{k}}$ .

Cryptography puzzle found on a website. Solutions to$a^2 + b^2 + c^2 + d^2 + e^2 = 2011^{2019} $

For what values of $a$ does $b\in\mathbb{N}$?

The best symbol for non-negative integers?

Is this a correct definition of the natural numbers in ZF?

Turn formula with remainder

Can the natural number have an uncountable set of subsets?

How do I show that the set of odd natural numbers is closed under the operation * defined by a*b=a+b+ab?

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