Proving isomorphism between $X$ and $Y$
96025
Showing there is only one isomorphism between well ordered sets using transfinite induction
133699
Proving that there is a bijection between $A$ and $B$.
145462
On the canonical isomorphism between $V$ and $V^{**}$
86174
Finding an isomorphism between these two finite fields
152495
Prove that if $X$ and $Y$ are Normal and independent random variables, $X+Y$ and $X-Y$ are independent
23125
Prove that there is a bijection between the set of all subsets of $X$, $P(X)$, and the set of functions from $X$ to $\{0,1\}$.
26302
Prove that $(X \cap Y) \cup Z = (X \cup Z) \cap (Y \cup Z)$
46116
Proof of the First Isomorphism Theorem for Groups
126790
Basic Isomorphism Question
46106
Prove that $D_r \circ D_s = \{ (x,y) \in \mathbb{R}^2 \ | \ |x-y|<r+s \}$, where $D_a = \{ (x,y) \in \mathbb{R}^2\ | \ |x-y| < a \}$
120288
Semigroup isomorphism
31937
How do I prove equality of x and y?
46841
When is a graph isomorphic to the source?
6171
Isomorphism between $\Bbb{Z}[\sqrt{d}]$ and a quotient of $\Bbb{Z}[X].$
58707
Prove Quotient Group Isomorphism
133884
A proof using Yoneda lemma
108704
Help with proof of $|x+y| \geq |x|-|y|$