Here you may find solutions (in Greek) to problem sets I have worked on in a variety of courses while an undergraduate student at the Department of Mathematics in the National and Kapodistrian University of Athens. For simplicity, I have divided the courses into five main sections (for now, these sections might expand later on): Graduate Courses, Analysis, Algebra, Combinatorics, Number Theory and Geometry. Information about (most of) these courses can be found here.
The solutions below might contain several mistakes (of all kinds). Feel free to contact me if you spot any of them!
Graduate Courses
Operator Theory (Evgenios Kakariadis, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3
Stochastic Processes (Dimitrios Cheliotis, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3
Analysis
Measure Theory (Marina Iliopoulou, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3
Harmonic Analysis (Marina Iliopoulou, Spring 2026) Problem Set 1, Problem Set 2, Problem Set 3
Algebra
Galois Theory (Mihalis Maliakas, Spring 2025) Problem Set 1
Basic Abstract Algebra (Mihalis Maliakas, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3, Problem Set 4, Problem Set 5
Topics in Algebra and Geometry I (Maria Papatriantafillou, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3
Commutative Algebra and Applications (Konstantinos Karagiannis, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3
Homological Algebra and Categories (Ioannis Emmanouil, Fall 2025) Problem Set 1, Problem Set 2
Combinatorics
Algebraic Combinatorics (Christos Athanasiadis, Spring 2026) Problem Set 1, Problem Set 2, Problem Set 3, Problem Set 4
Number Theory
Analytic Number Theory (Nikolaos Skarmogiannis, Fall 2025) Problem Set 1, Problem Set 2, Problem Set 3
Geometry
Projective Geometry (Maria Papatriantafillou, Spring 2025) Problem Set 1, Problem Set 2