Every morphism from $\mathbb{P}^1\rightarrow \mathbb{A}^1$ is constant
101893
Is there a classification of regular maps $\mathbb{P}^1(k)\to\mathbb{A}^1(k)$?
119999
A property of every real polynomial.
52012
Is there exist a homemoorphism between either pair of $(0,1),(0,1],[0,1]$
22297
Normal operator $\Rightarrow$ S invariant implies $S^\perp$ invariant
27629
How to prove that $S^{2n+1}/S^1$ is homeomorphic to $\mathbb CP^n$ under a given identification
90010
Can we ascertain that there exists an epimorphism $G\rightarrow H$?
52354
Given a idempotent endomorphism, show that $M = \ker(f) \oplus \ker (f-\text{id}_M)$
135256
The fiber of a covering space over a connected space has constant cardinality
144105
Ring homomorphism from $\mathbb Z$ to $\mathbb Z$ is always identity or $0$
1026
Ring homomorphism with $\phi(1_R) \neq1_S$
130081
Show that $A_n$ is the kernel of a group homomorphism of $S_n \rightarrow \{−1,1\}$.
142577
Algebraic proof that a set generated by irrational rotations is dense in $S^1$.
151354
Why are there no non-trivial regular maps $\mathbb{P}^n \to \mathbb{P}^m$ when $n > m$?
132311
T$\mathbb{S}^{n} \times \mathbb{R}$ is diffeomorphic to $\mathbb{S}^{n}\times \mathbb{R}^{n+1}$
155828
How do I show that $A$ and $A^T$ are similar, given that the minimal polynomial of $A$ splits over $\mathbb{F}$?
67199
Isomorphism $H_n(D^n, S^{n - 1};A)$ and $A$
66610
Finding a correspondence between $\{0,1\}^A$ and $\mathcal P(A)$