List questions from discrete-mathematics

Published on 26 Nov 2018 - 0:24

524

Views

Determine whether 271 is invertible modulo 2018, and if so find an inverse a.

Published on 11 Apr 2026 - 20:08

167

Views

Determine all functions $f : \mathbb{N} \rightarrow \mathbb{N}$ such that, for every positive integer $n$, we have: $2n+2001≤f(f(n))+f(n)≤2n+2002$.

Published on 25 Mar 2026 - 4:43

98

Views

Minimal elements

Published on 14 Apr 2026 - 11:29

343

Views

How can we evaluate the sequence ${}_3C_1+{}_7C_2+{}_{11}C_3+\dots+{}_{4n-1}C_n=$?

Published on 26 Nov 2018 - 11:09

159

Views

exact-closed form solution of recurrence

Published on 14 Apr 2026 - 5:12

226

Views

Big O summation and additivity

Published on 12 Apr 2026 - 10:45

156

Views

large numbers as counterexamples

Published on 12 Apr 2026 - 23:57

86

Views

exact-closed form solutions of recurrences

Published on 14 Apr 2026 - 10:42

154

Views

How to find a spanning tree?

Published on 05 Apr 2026 - 14:19

120

Views

Asymptotic behaviour of recurrence

Published on 12 Apr 2026 - 8:45

59

Views

Can all of the first and second differences of a Costas array be at least 3 in magnitude?

Published on 13 Apr 2026 - 20:10

131

Views

Discrete Probability: Determine if the events are Independent or not

Published on 14 Apr 2026 - 9:05

315

Views

How many different pairs of integers $(x,y)$ modulo $p$ such that $ax^2+by^2+c \equiv 0\pmod{p}$?

Published on 26 Nov 2018 - 18:32

45

Views

An error in a proof due to variable creep?

Published on 09 Apr 2026 - 15:56

List Question

symbol for a 'is the same as saying' b or a 'can be rewritten as' b

Determine whether 271 is invertible modulo 2018, and if so find an inverse a.

Determine all functions $f : \mathbb{N} \rightarrow \mathbb{N}$ such that, for every positive integer $n$, we have: $2n+2001≤f(f(n))+f(n)≤2n+2002$.

Minimal elements

How can we evaluate the sequence ${}_3C_1+{}_7C_2+{}_{11}C_3+\dots+{}_{4n-1}C_n=$?

exact-closed form solution of recurrence

Big O summation and additivity

large numbers as counterexamples

exact-closed form solutions of recurrences

How to find a spanning tree?

Asymptotic behaviour of recurrence

Can all of the first and second differences of a Costas array be at least 3 in magnitude?

Discrete Probability: Determine if the events are Independent or not

How many different pairs of integers $(x,y)$ modulo $p$ such that $ax^2+by^2+c \equiv 0\pmod{p}$?

An error in a proof due to variable creep?

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