Foundations of Mathematics
48684
Does mathematics become circular at the bottom? What is at the bottom of mathematics?
28045
What are the foundations of philosophy?
130771
Sets and the principle of inclusion and exclusion
45878
Elementary Set Theory: Ordinals, Well Orderings and Isomorphisms
20252
The Axiom of Choice and the Cartesian Product.
127233
Cardinality of order types in $\mathbb{N}$
68430
Proving the countability of algebraic numbers
109964
the converse of Pythagoras Theorem
106157
Proof of Euclid's lemma using fundamental theorem of arithmetic
42588
Background to start Galois theory
42923
A Book for abstract Algebra
140868
Axiomatization of $\mathbb{Z}$ via well-ordering of positives.
115224
Equivalences of $\diamondsuit$-principle.
23414
Topologist's Sine Curve: A rigorous proof of why $\overline{S} = S \cup V$
6498
Introductory measure theory textbook
142840
Open axioms of equality
3663
Finding counterexamples in elementary set theory.