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New posts in discrete-mathematics
Venn diagram with rectangles for $n > 3$
combinatorics
discrete-mathematics
combinatorial-geometry
rectangles
How would I figure out how many anagrams of mississippi don't contain the word psi?
combinatorics
statistics
discrete-mathematics
permutations
How do I know when to use nCr button and when to use nPr button on my calculator in which situation? [closed]
discrete-mathematics
Negate and Simplify $p\wedge (q\vee r)\wedge(\neg p\vee\neg q\vee r)$
discrete-mathematics
logic
propositional-calculus
Integers $1, 2, \ldots, 10$ are circularly arranged in an arbitrary order. [duplicate]
discrete-mathematics
How to find non-isomorphic trees?
discrete-mathematics
trees
graph-isomorphism
How is the relation "the smallest element is the same" reflexive?
discrete-mathematics
elementary-set-theory
relations
equivalence-relations
Theory of definitions
discrete-mathematics
logic
definition
predicate-logic
Prove two sets have same Cardinality by writing down bijection
discrete-mathematics
elementary-set-theory
Any $B \subset \{10,11,...,99\}$, with $|B| =10$ has two subsets such that $\sum_{a \in B_1} a = \sum_{b \in B_2} b$
combinatorics
discrete-mathematics
pigeonhole-principle
Fibonacci numbers divisible by $9$
combinatorics
elementary-number-theory
discrete-mathematics
fibonacci-numbers
Explicit solution of the recursion $x_n = x_{n-1}^2 - 2$ with $x_0>2$
sequences-and-series
discrete-mathematics
recursion
ceiling-and-floor-functions
Graph with even vertices and ${n-1}\choose 2$ $+ 1$ edges has a perfect matching
combinatorics
discrete-mathematics
graph-theory
hamiltonian-path
matching-theory
How to start proving $A \times B \times C \ne (A \times B) \times C$?
elementary-set-theory
discrete-mathematics
Proving for all integer $n \ge 2$, $\sqrt n < \frac{1}{\sqrt 1} + \frac{1}{\sqrt 2}+\frac{1}{\sqrt 3}+\cdots+\frac{1}{\sqrt n}$ [duplicate]
elementary-number-theory
discrete-mathematics
summation
induction
radicals
How many bit strings of length 8 start with "1" or end with "01"?
combinatorics
discrete-mathematics
computer-science
inclusion-exclusion
bit-strings
Hint for problem on $4 \times 7$-chessboard problem related to pigeonhole principle
combinatorics
discrete-mathematics
puzzle
pigeonhole-principle
Chromatic Polynomial
combinatorics
discrete-mathematics
graph-theory
coloring
Prove $\sum_{k= 0}^{n} k \binom{n}{k} = n \cdot 2^{n - 1}$ using the binomial theorem
discrete-mathematics
summation
binomial-coefficients
binomial-theorem
Find the number of ways to express 1050 as sum of consecutive integers
combinatorics
elementary-number-theory
discrete-mathematics
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