Proving the product of an odd number and the power of 2 is bijective
96341
Proving $v(s,p)=2^{p-1}(2s-1)$ is a bijection of natural numbers and $f(s)=2s-1$ is a bijection between natural numbers and odd numbers.
4776
Prove that the power set of an $n$-element set contains $2^n$ elements
133699
Proving that there is a bijection between $A$ and $B$.
157294
Prove that if $n>1$ is odd, then $1^n+2^n+3^n+\ldots+(n-1)^n$ is divisible by $n$
145214
Showing the power set is equinumerous to ${}^X2$
49953
Proving that a function from $N\times N$ to $N$ is bijective.
128199
Proving gcd(a, a+2) is 1 or 2 for every integer a?
77064
Proving $\gcd((a+b)^m,(a-b)^m)\le2^m$ for coprime $a,b$ and $m \in \Bbb N$
41359
Constructing a bijection
37951
proof detail concerning bijection between a set and its power set
6453
Let $n \geq 1$ be an odd integer. Show that $D_{2n}\cong \mathbb{Z}_2 \times D_n$.
53194
Prove : $p$(n│even number of ODD parts)=$p$(n│distinct parts ,number of ODD parts is even )
157268
Proving a bijection with absolute value
103538
Partitions of $n$ into distinct odd and even parts proof
94570
Proof that every odd integer is a difference of two squares
85272
$3x + 1$ is even iff $5x-2$ is odd
8366
Proof of $a^n+b^n$ divisible by $a+b$ when $n$ is odd