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New posts in discrete-mathematics
Reflexive Transitive Closure
discrete-mathematics
relations
What would a function $F:\mathbb{N} \times \mathbb{N} \rightarrow \{0, 1\}$ look like?
discrete-mathematics
notation
Calculate the sum $S_n = \sum\limits_{k=1}^{\infty}\left\lfloor \frac{n}{2^k} + \frac{1}{2}\right\rfloor $
real-analysis
discrete-mathematics
summation
ceiling-and-floor-functions
Getting everyone to meet everyone else
combinatorics
discrete-mathematics
graph-theory
combinatorial-designs
Number of $n^2\times n^2$ permutation matrices with a 1 in each $n\times n$ subgrid
combinatorics
discrete-mathematics
Bijection between Prime numbers and Natural numbers
number-theory
discrete-mathematics
prime-numbers
natural-numbers
Stirling numbers combinatorial proof
combinatorics
discrete-mathematics
inclusion-exclusion
combinatorial-proofs
stirling-numbers
convert ceil to floor
discrete-mathematics
computer-science
How can I complete this proof by contradiction?
discrete-mathematics
proof-verification
alternative-proof
Evaluate and prove by induction: $\sum k{n\choose k},\sum \frac{1}{k(k+1)}$ [duplicate]
discrete-mathematics
summation
induction
binomial-coefficients
Palindrome Subtraction
combinatorics
discrete-mathematics
computational-mathematics
How many sequence of integers ($j_1 , j_2 , . . . , j_k$) are there such that $0 ≤ j_1 ≤ j_2 ≤ . . . ≤ j_k ≤ n$?
combinatorics
inequality
discrete-mathematics
Poker and Combinatorics (Don't Mix): How to solve this problem?
combinatorics
discrete-mathematics
logic
permutations
Construct partition such that sum of chromatic numbers is greater than chromatic number of graph
discrete-mathematics
graph-theory
coloring
Prove that if $a+b+c$ divides $abc$, then $a+b+c$ must be composite.
elementary-number-theory
discrete-mathematics
Number or regions formed when $n$ points on a circle are joined
combinatorics
discrete-mathematics
induction
Showing $\alpha(\beta+1)\leq\frac{5}{3}\alpha^2+\frac{1}{3}\beta^2$ for nonnegative integers $\alpha$ and $\beta$.
algebra-precalculus
discrete-mathematics
In a club with 99 people, everyone knows at least 67 people. Prove there's a group of 4 people where everyone knows each other
combinatorics
discrete-mathematics
graph-theory
recreational-mathematics
Need to translate into symbols "Someone in this class has done Data Structures”?
discrete-mathematics
logic
propositional-calculus
predicate-logic
Find the highest power of two in the expression.
combinatorics
elementary-number-theory
discrete-mathematics
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