How can I show regular language is closed under square root?
92135
If $A$ is regular, is the language $\{x \;\mid\; \exists y : |y| = |x|^2, xy \in A\}$ regular?
105003
Decimal number regular expression, where digit after decimal is optional
142285
What's the regular expression that matches a square bracket?
46698
Showing a set is closed under inverses
148496
How to show that an expression is 0 if FullSimplify never finishes
20437
Closed surjection that does not preserve regularity
92543
Regular expressions: Show that A*B is the solution of X = AX + B
5448
Finding the closure of some subsets of the ordered square
137646
show that language $L'$ is regular (given $L$ regular)
85223
Regular expression for math operations with parentheses
1039
Substring with range out of bounds?
40525
Fastest way to determine if an integer's square root is an integer
107694
How to test if a number is a primitive root?
112519
Line break in a modified proof environment (with show/hide feature)
78300
Showing a set is closed other than giving a counterexample?
76685
Determine $\text{Aut}(S)$ where $S = \mathbb{Q}[x]/(x^2)$
127672
How to detect a floating point number using a regular expression