Isomorphism between Projective Varieties
70861
$\mathbb P^n\times \mathbb P^m\not\cong \mathbb P^{m+n}$
136083
Show that $\sigma\circ\phi : G_1 \to G_3$ is an isomorphism
72211
Isomorphism involving Eilenberg-Maclane space, Tors.
40490
Birational isomorphism $\mathbb{P}^n\times \mathbb{P}^m\to \mathbb{P}^{n+m}$
111183
Nonsingular projective variety of degree $d$
102371
Proving that two vector spaces of equal dimension are isomorphic
117131
Canonical Isomorphism Between $\mathbf{V}$ and $(\mathbf{V}^*)^*$
62711
Canonical map $R/(I\cap J)\rightarrow R/I\times _{R/(I+J)} R/J$ is an isomorphism
109610
Is $\mathbb{R}[X]/(P)$ isomorphic to $\mathbb C$ for every irreducible polynomial $P$ of degree $2?$
29359
Localisation isomorphic to a quotient of polynomial ring
61491
Complex Ring Isomorphism
20556
Isomorphism between two models of Hilbert's Axioms with different notions of congruence
25793
Extension fields isomorphic to fields of matrices
63605
Irreducible polynomials and affine variety
6171
Isomorphism between $\Bbb{Z}[\sqrt{d}]$ and a quotient of $\Bbb{Z}[X].$
157597
Homeomorphism between $\mathbb{Q}$ and $\mathbb{Q}(>0)$, and $\mathbb{Q}(\ge 0)$
157915
Isomorphism between the group $(\mathbb Z[x], +)$ and $(\mathbb Q_{>0}, .)$