Problemsets and study materials, among other things

Because the one from LSM is painful to look at

Sum of two squares theorem, Euler's theorem and Legendre's formula, alongside problems from the Latvian Open Mathematical Olympiad

What is Ptolemy's theorem, as well as a related problem from the Latvian Open Mathematics Olympiad

Introducing Faulhaber's formula and its consequent results, with problems from the Latvian Open Mathematics Olympiad

What is the Simson line, and a relevant Latvian Open Mathematics Olympiad problem

A look at Cauchy's inequality and problems from the Latvian Open Mathematics Olympiad

A look at the rational root theorem, polynomial division, and problems from the Latvian Open Mathematics Olympiad

An accessible journey through Lambert's proof