Theorems about the divisors of numbers contained in the form $paa \pm qbb$

Theorems on residues obtained by the division of powers

Theorie des groupes et psychologie de l'intelligence

There are infinitely many prime numbers in all arithmetic progressions with first term and difference coprime

Things to do with a broken stick

Thoughts on the Riemann hypothesis

Through a Glass Darkly

Tolstoy's Mathematics in "War and Peace"

Topical Bias in Generalist Mathematics Journals

Topology and subsets - the story of a theorem

Totally real origami and impossible paper folding

Touching the $Z_2$ in Three-Dimensional Rotations

Towards historical roots of necessary conditions of optimality. Regula of Peano

Traits

Trees, permutations and the tangent function

Tricky Arithmetic

Trisections and Totally Real Origami

Truth and the liar paradox

Two philosophical applications of algorithmic information theory

Ueber die Geometrie der alten Aegypter