Proving size of a collection of ordered pairs of disjoint subsets using bijection
136735
Why is the cardinality of set S is 3^n, where S is the collection of all ordered pairs of disjoint subset of {1,2,3,...,n} where n is non negative.
127123
Cardinality of power set and binary sequence
153072
Guessing a subset of $\{1,...,N\}$
150790
Prove two sets have same Cardinality by writing down bijection
67451
Building a bijection from a finite union of countable sets to $\mathbb{N}$
30021
Bijection between set of all binary sequences and power set of $\mathbb N$.
118560
Ordered N-Tuples as Cartesian Products of Indexed Families
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs
36184
Countability of disjoint intervals
62687
Proving Cardinality of Cosets in Abstract Algebra
18429
Counting measure proof
72440
Partition a set into $k$ non-empty subsets
5448
Finding the closure of some subsets of the ordered square
72591
Find a bijection to prove a fact about integer partitions
146204
Subsets sharing at most $i$ elements
113668
Uncountable chain of subsets of $\mathbb N$
38286
Proving the Cantor Pairing Function Bijective