Using $\mathbb{Z}/4\mathbb{Z}$ to construct a counterexample to submodules of free modules being free

A Young Math Enthusiast's Fear

probability of being dealt four of a kind in poker

Why doesn't the "zig-zag" comb deformation retract onto a point, even though it's contractible?

Is Mega Millions Positive Expected Value?

Convergence in $L^p$ of $f_n$ implies convergence in $L^1$ of $|f_n|^p$ and $f_n^p$

Prove that an infinite ring with finite quotient rings is an integral domain

Differentiablility over closed intervals

Intersections of all subgroups is a nontrivial subgroup, so every element has finite order.

Finding $x^2+y^2+z^2$ given that $x+y+z=0$, $x^3+y^3+z^3=3$ and $x^4+y^4+z^4=15$

Proving that $x^n$ converges to $0$ whenever $|x| < 1$

Continuity and the Axiom of Choice

How can I construct the matrix representing a linear transformation of a 2x2 matrix to its transpose with respect to a given set of bases?

Related