List questions from discrete-mathematics

Published on 10 Apr 2026 - 20:22

34

Views

Operation on Sets - Listing the elements

Published on 13 Apr 2026 - 3:57

464

Views

Direct proof for $a \rightarrow b, c \rightarrow b, d \rightarrow (a \lor c), d \Rightarrow b$

Published on 13 Apr 2026 - 20:41

1.9k

Views

Prove that if $r^2$ is irrational then $r$ is irrational.

Published on 13 Apr 2026 - 22:23

76

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How many integers of $ m $ digits are equal to the sum of the $ m $ -th powers of their digits in base $7$ in the interval $[1, ..., 10 ^ 7]$?

Published on 14 Apr 2026 - 11:31

40

Views

System of linear recurrences; finding an explicit description for both sequences involved.

Published on 12 Apr 2026 - 4:16

48

Views

Permutations of two rotating groups

Published on 11 Apr 2026 - 10:22

49

Views

Understanding an expression which related to full binary trees

Published on 12 Apr 2026 - 4:00

1.8k

Views

Find the argument form for the argument and determine whether it is valid

Published on 15 Apr 2026 - 12:14

1.2k

Views

Perfect matchings in bipartite graphs.

Published on 17 Apr 2026 - 7:36

5.1k

Views

Putting socks and shoes on a spider

Published on 14 Apr 2026 - 12:20

294

Views

Magic labeling of the octahedron graph

Published on 17 Apr 2026 - 2:32

462

Views

Why is the formula for combinations with repetition equal to $(n + k - 1)$ choose $k$?

Published on 15 Apr 2026 - 22:58

111

Views

How to find the integer solution for $6x + 25 = 7y$?

Published on 12 Apr 2026 - 6:34

1.4k

Views

Show that given any rational number $x$, there exists an integer $y$ such that $x^2y$ is an integer

Published on 15 Apr 2026 - 15:42

List Question

Fast parallel multiplication method

Operation on Sets - Listing the elements

Direct proof for $a \rightarrow b, c \rightarrow b, d \rightarrow (a \lor c), d \Rightarrow b$

Prove that if $r^2$ is irrational then $r$ is irrational.

How many integers of $ m $ digits are equal to the sum of the $ m $ -th powers of their digits in base $7$ in the interval $[1, ..., 10 ^ 7]$?

System of linear recurrences; finding an explicit description for both sequences involved.

Permutations of two rotating groups

Understanding an expression which related to full binary trees

Find the argument form for the argument and determine whether it is valid

Perfect matchings in bipartite graphs.

Putting socks and shoes on a spider

Magic labeling of the octahedron graph

Why is the formula for combinations with repetition equal to $(n + k - 1)$ choose $k$?

How to find the integer solution for $6x + 25 = 7y$?

Show that given any rational number $x$, there exists an integer $y$ such that $x^2y$ is an integer

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