Taking a Putnam (General Questions)
67692
Studying for the Putnam Exam
65587
Strategy for "Which is better" questions
74157
Need help interpreting a passage from an old text on Diophantine equations
118189
Proving the pairing axiom from the rest of ZF
132346
a linear algebra multiple choice problem
27840
What about $[n,k,7]$ binary perfect code? (Exercise from the book Fundamentals of Error Correcting Codes)
63656
Ways to write 'P => Q'
132931
Determining the parity of the coefficients of a quadratic given that there is a rational solution
47116
Sources to learn about Greens functions
42213
Computing $\text{Gal}(\mathbb{Q}^{ab}/\mathbb{Q})$
68032
A Representation Theory Problem in Putnam Competition
26671
Does this seemingly elementary question require König's theorem?
65379
Deriving $\neg R$ from $\{R↔(R∨(P∧¬P)), R↔¬P, ¬P→(P↔(Q→Q)), P→Q\}$
28155
Two questions about diagonalization
61132
Multiple-choice question about the probability of a random answer to itself being correct
73069
A riddle (in C)
92024
Elementary number theory - prerequisites