New posts in Discrete Mathematics

Sets of integers that can be placed in a magic square

Define $1+x+x^2+\cdots+x^n$ recursively

Prove With Three Real Numbers Prove That We Can Pick Two And Their Product is Non Negative

How to Prove Something is a Contradiction only by Logical Equivalencies

How to show that any polytope $P$ is spanned by the neighboring edges of any vertex $x$?

Verification of a solution to a mathematical logic problem

Book recommendation : Olympiad Combinatorics book

If $15$ distinct integers are chosen from the set $\{1, 2, \dots, 45 \}$, some two of them differ by $1, 3$ or $4$.

How many distinct permutations of the string "NADAMADRID" have the word DAM appearing in them?

If $x$ and $y$ are integer variables that have value $0$ or $1$, then what does the expression $x + y - xy$ mean?