23 Answers votes newest views recent 17Examples of common false beliefs in mathematics. (3) 6Applications of the Chinese remainder theorem 0Knuth’s intuition that Goldbach might be unprovable 23Quick proofs of hard theorems -3Solutions to the Continuum Hypothesis 0What are examples of mathematical concepts named after the wrong people? (Stigler’s law) 3Math paper authors' order 5Errata for Atiyah-Macdonald 2What does it mean for a mathematical statement to be true? 4Can a vector space over an infinite field be a finite union of proper subspaces? 1Shortest/Most elegant proof for $L(1,\chi)\neq 0$ 5Suggestions for good books on class field theory 4When Animals Attack 4Expressing adj(A) as a polynomial in A? 4Galois theory timeline 7Cardinality of the permutations of an infinite set 0Unbounded operator bounded in a dense subset 1Subset of the plane that intersects every line exactly twice 2How would one even begin to try to prove that a simple number-theoretic statement is undecidable? 9“Sums-compact” objects = f.g. objects in categories of modules? 3Are there locally compact groups which have no compact open subgroups and no discrete infinite cyclic subgroups? 5Closedness of finite-dimensional subspaces 1Discrete cyclic subgroup.