converse of Lagrange theorem in algebra
18181
Complete classification of the groups for which converse of Lagrange's Theorem holds
115502
Analogue of the Cantor-Bernstein-Schroeder theorem for general algebraic structures
34714
What is the relationship between $\ker(A), \ker(A^2), \ldots, \ker(A^n)$?
50273
How to prove $\lvert \lVert x \rVert - \lVert y \rVert \rvert \overset{\heartsuit}{\leq} \lVert x-y \rVert$?
24478
What is the name of this theorem, and are there any caveats?
22424
Has this "generalized semidirect product" been studied?
156034
sufficient condition for a polynomial to have roots in $[0,1]$
1712
$ d_1,d_2\mid n\iff {\rm lcm}(d_1,d_2)\mid n\ $ [LCM Universal Property]
32136
How to prove Lucas's Converse of Fermat's Little Theorem without using primitive root?
36043
If $ab \equiv r \pmod{p}$, and $x^2 \equiv a \pmod{p}$ then $y^2 \equiv b \pmod{p}$ for which condition of $r$?
77837
The converse of Newton's shell theorem
45370
Is it true that $|d(x, z) - d(y, z)| \leq d(x, y)$ and how do I prove it?
7437
Converse of mean value theorem
49240
$\forall x,y \in \mathbb{R}:\vert\cos x- \cos y\vert\leq\vert x-y\vert$
3820
Prove that $||x|-|y||\le |x-y|$
106799
Proof Verification: Converse of Intermediate Value Theorem
100257
Converse to Hilbert basis theorem