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1h
revised Verifying logic without drawing truth tables
added 1344 characters in body
May
26
revised How many pairs of adjacent bits?
added 816 characters in body
May
26
revised How many pairs of adjacent bits?
deleted 89 characters in body
May
26
revised How many pairs of adjacent bits?
Added MathJax, clarified statement.
May
25
revised How to prove $\sum\limits_{i=0}^n (-1)^i \binom{n}{i} \binom{n-i}{k}=0$
added 138 characters in body
May
25
revised How to solve certain types of integrals
Added missing dx.
May
25
revised for all $x$, $P(x)$ implies there exists $x$, $P(x)$?
Replaced image with text, cleaned up a bit.
May
25
revised How to find weight function using generating series?
Replaced periods with centre dots.
May
24
revised partition of integers proof
MathJax, and added missing definition.
May
24
revised Combinatorics: number of functions/predicates satisfying a sum on their entries
Improved MathJax.
May
24
revised Prove that if $A \mathbin{\triangle} C = B \mathbin{\triangle} C$, then $A = B$
Fixed MathJax.
May
23
revised Can a point $z$ which belongs to a closed set be a limit point of an open set which is disjoint from the closed set in topological space $X$?
added 502 characters in body
May
19
revised Help with a proof of pairs of real numbers
replaced picture with text.
May
19
revised Covers of X in the Stone-Cech compacticatoin
added 310 characters in body
May
18
revised Sets: How to show that relation R is not transitive?
added 264 characters in body
May
16
revised the number of $n\times n$ matrices of 0's and 1's such that every row and column has three 1's
Added the formula.
May
16
revised Inclusion-Exclusion: INTELLIGENT permutations
rolled back to a previous revision
May
16
revised proof for Erdős-Szekeres theorem using Dilworth's theorem
Spelling of Erdős.
May
16
revised Inclusion-Exclusion: INTELLIGENT permutations
formatting
May
16
revised In a metric space, is every convergent sequence bounded?
added 124 characters in body