Algebraical "thing" having two inverses per element?
140190
Binary operation $xy$, has identity, but not associativity. Is the inverse unique?
141313
Inline elements denoted by {{}}? Cartesian product of these inline elements?
6324
Deriving the inverse of a 2x2 matrix
87999
Product Notation for Multiplication in Reverse Order
127764
Showing that $\mathbb{Q}[\sqrt{2}, \sqrt{3}]$ contains multiplicative inverses
76327
Finding inverse of polynomial in a field
119299
Getting inverse of a transposition key
126025
Computing the inverse of a permutation
55049
How to find the inverse modulo $m$?
84466
How to compute the inverse of a polynomial under $GF(2^8)$?
45523
Can the product of two non invertible elements in a ring be invertible?
149248
Pushforward of inverse map at the identity?
78307
Under what conditions is $AA^T$ invertible?
99815
Dividing versus multiplying by inverse in modular arithmetic
69721
$(a,b) \mathbin\# (c,d)=(a+c,b+d)$ and $(a,b) \mathbin\&(c,d)=(ac-bd(r^2+s^2), ad+bc+2rbd)$. Multiplicative inverse?
80616
A ring with few invertible elements
17584
Integer matrices with integer inverses