Prob 2(d) Sec 9, in Munkres' TOPOLOGY 2nd edition: Is it possible to construct a choice function?
84394
Choice function for a collection of nonempty subsets of $\{0,1\}^\omega$
77548
Given an arbitrary infinite set $S$, how to construct an injection $\mathbb{N} \to S$ with the Axiom of Choice?
65308
Axiom of Choice: Family of non-empty sets mutually disjoint or not?
44620
Reference for combinatorial game theory.
34929
Prove ${M}\choose{N_1}$ ${M}\choose{N_2}$ $\leq$ ${2M}\choose{N_1+N_2}$ for $M, N_1, N_2 \in \mathbb{N},\,M\geq N_1,N_2$.
14711
set theoretic function, products of sets (product versus Cartesian product)
146062
A "Cantor-Schroder-Bernstein" theorem for partially-ordered-sets
45623
Axiom of Choice: What exactly is a choice, and when and why is it needed?
144899
Do We Need the Axiom of Choice for Finite Sets?
149277
Does well-ordering of the proper class of cardinal numbers imply choice?
59289
Nested Sequence of Topological Space and the Coherent Topology; Munkres Topology 35.9
27661
The closed graph theorem in topology
24091
How many ways can $r$ nonconsecutive integers be chosen from the first $n$ integers?
17624
Axiom of Choice iff Every set has a choice function
101986
Prob. 2, Sec. 20 in Munkres' TOPOLOGY, 2nd ed: The dictionary order topology on $\mathbb{R} \times \mathbb{R}$ is metrizable.
83757
Is the following equivalent to the axiom of choice?
136037
${n\choose 2} - {k\choose 2} = {n-k\choose 2} +k(n-k)$ Marked box or unmarked box