List questions from discrete-mathematics

Published on 25 Mar 2026 - 17:40

38

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Can we find Convolution Sum Boundaries without graphical plot (Analytic Method)?

Published on 25 Mar 2026 - 9:33

88

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Prove that any graph $G$ has two sided subgraph $H$, where $|E(H)| \ge {|E(G)| \over2}$

Published on 28 Mar 2026 - 5:28

507

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Question regarding quadratic residue

Published on 27 Mar 2026 - 8:08

772

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Cardinality of open sets of $\mathbb{R}^d$

Published on 02 Apr 2018 - 13:31

84

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Reducing a system of Linear Recurrences

Published on 26 Mar 2026 - 19:54

305

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Evaluate $\sum_{r=0}^{100} {(-1)^{r} {100 \choose r} {r^{50}}}$

Published on 25 Mar 2026 - 17:40

69

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Generating function for sequence

Published on 02 Apr 2018 - 19:00

206

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Prove $\operatorname{height}(P) \cdot \operatorname{width}(P) \geq |A|$ in partially ordered set?

Published on 25 Mar 2026 - 1:17

1.4k

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Prove the existence of graph, which doesn't contain three vertices with same degree.

Published on 28 Mar 2026 - 5:22

43

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Proving $\sum_{i=1}^n 3^i\log_2(i) \in \theta( 3^n\log_2(n))$

Published on 25 Mar 2026 - 16:03

694

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Problem: Roll two dice and find the pmf of X

Published on 27 Mar 2026 - 19:53

39

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Finding parameters in combinatorics

Published on 03 Apr 2018 - 12:57

2.9k

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Roll two dice, find the pmf of X if X is the difference between largest and smallest number

Published on 27 Mar 2026 - 19:55

346

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Orthogonal $4x4$ Latin Squares

Published on 01 Apr 2026 - 2:35

List Question

Can this be Combinatorial proof for $n2^{n-1}$ = $\sum_{k=0}^{n}k {n \choose k}$

Can we find Convolution Sum Boundaries without graphical plot (Analytic Method)?

Prove that any graph $G$ has two sided subgraph $H$, where $|E(H)| \ge {|E(G)| \over2}$

Question regarding quadratic residue

Cardinality of open sets of $\mathbb{R}^d$

Reducing a system of Linear Recurrences

Evaluate $\sum_{r=0}^{100} {(-1)^{r} {100 \choose r} {r^{50}}}$

Generating function for sequence

Prove $\operatorname{height}(P) \cdot \operatorname{width}(P) \geq |A|$ in partially ordered set?

Prove the existence of graph, which doesn't contain three vertices with same degree.

Proving $\sum_{i=1}^n 3^i\log_2(i) \in \theta( 3^n\log_2(n))$

Problem: Roll two dice and find the pmf of X

Finding parameters in combinatorics

Roll two dice, find the pmf of X if X is the difference between largest and smallest number

Orthogonal $4x4$ Latin Squares

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