List questions from discrete-mathematics

Published on 31 Mar 2026 - 10:58

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There are $2n+1$ people. For each $n$ people there is somebody who is friend with each of them. Prove there is a "know-them-all" person.

Published on 27 Mar 2026 - 0:05

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Modeling counting problems - Proof verification

Published on 05 Apr 2026 - 13:28

114

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An identity on Rencontres numbers

Published on 27 Mar 2026 - 0:09

49

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Error Correcting Polynomial Code

Published on 28 Mar 2026 - 20:50

59

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Counting the number of solutions to an equation involving floor and ceiling function

Published on 25 Mar 2026 - 17:39

172

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Find a close formula using generating functions

Published on 27 Mar 2026 - 1:42

33

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Which branch of mathematics studies the parameters of logical problems?

Published on 07 Jul 2018 - 15:23

57

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How do I find number of subsets satisfying two constraints?

Published on 07 Jul 2018 - 15:30

49

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How do you find cardinality of the set of functions $A\to A$? How to take the first step to approach this?

Published on 08 Jul 2018 - 1:13

192

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Vacuous definition - annoying condition

Published on 25 Mar 2026 - 17:29

204

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Show that $\binom {2n}n \leq(2n)^{\pi (2n)}$ where $\pi(2n) $ is number of prime number less than $2n$

Published on 31 Mar 2026 - 0:32

47

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Prove or disprove: Given signature and structures, isomorphism... Then the structure is unique

Published on 25 Mar 2026 - 22:03

57

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Lines and Points

Published on 06 Apr 2026 - 13:10

108

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a locally confluent and terminatting rewrite system is complete

Published on 25 Mar 2026 - 6:02

List Question

group subtraction inequality

There are $2n+1$ people. For each $n$ people there is somebody who is friend with each of them. Prove there is a "know-them-all" person.

Modeling counting problems - Proof verification

An identity on Rencontres numbers

Error Correcting Polynomial Code

Counting the number of solutions to an equation involving floor and ceiling function

Find a close formula using generating functions

Which branch of mathematics studies the parameters of logical problems?

How do I find number of subsets satisfying two constraints?

How do you find cardinality of the set of functions $A\to A$? How to take the first step to approach this?

Vacuous definition - annoying condition

Show that $\binom {2n}n \leq(2n)^{\pi (2n)}$ where $\pi(2n) $ is number of prime number less than $2n$

Prove or disprove: Given signature and structures, isomorphism... Then the structure is unique

Lines and Points

a locally confluent and terminatting rewrite system is complete

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