MAT138 — Introduction to Proofs (Fall 2025)

  Mon 4–5 PM; Wed 3–5 PM   Mon: Bahen 1200; Wed: Bahen 1210

Quick info

Instructor: Alex Youcis

Email: alex.youcis@utoronto.ca (see syllabus for email policy!)

Office hours: Mon 2:30–4 (PGB003)

Syllabus: PDF

Lecture — Date Topic / Notes Text (chapter) Board photos
Lecture 1 — Sep 3, 2025 (Wed)Anatomy of a proof, proof that \(\sqrt{2}\) is irrational Chapters 1–2Lecture 1 photos
Lecture 2 — Sep 8, 2025 (Mon)TBATBATo be posted
Lecture 3 — Sep 10, 2025 (Wed)TBATBATo be posted
Lecture 4 — Sep 15, 2025 (Mon)TBATBATo be posted
Lecture 5 — Sep 17, 2025 (Wed)TBATBATo be posted
Lecture 6 — Sep 22, 2025 (Mon)TBATBATo be posted
Lecture 7 — Sep 24, 2025 (Wed)TBATBATo be posted
Lecture 8 — Sep 29, 2025 (Mon)TBATBATo be posted
Lecture 9 — Oct 1, 2025 (Wed)TBATBATo be posted
Lecture 10 — Oct 6, 2025 (Mon)TBATBATo be posted
Lecture 11 — Oct 8, 2025 (Wed)TBATBATo be posted
— Oct 13, 2025 (Mon)No lecture (holiday)——
Lecture 12 — Oct 15, 2025 (Wed)TBATBATo be posted
— Oct 20, 2025 (Mon)Midterm review——
— Oct 22, 2025 (Wed)Midterm——
— Oct 27, 2025 (Mon)Reading week — no lecture——
— Oct 29, 2025 (Wed)Reading week — no lecture——
Lecture 13 — Nov 3, 2025 (Mon)TBATBATo be posted
Lecture 14 — Nov 5, 2025 (Wed)TBATBATo be posted
Lecture 15 — Nov 10, 2025 (Mon)TBATBATo be posted
Lecture 16 — Nov 12, 2025 (Wed)TBATBATo be posted
Lecture 17 — Nov 17, 2025 (Mon)TBATBATo be posted
Lecture 18 — Nov 19, 2025 (Wed)TBATBATo be posted
Lecture 19 — Nov 24, 2025 (Mon)TBATBATo be posted
Lecture 20 — Nov 26, 2025 (Wed)TBATBATo be posted
Quiz Date Topics Solutions
Quiz 1Sep 12Lectures 1–3To be posted
Quiz 2Sep 26Lectures 4–7To be posted
Quiz 3Oct 10Lectures 8–11To be posted
Quiz 4Nov 7Lectures 14 & 15To be posted
Quiz 5Nov 21Lectures 16–19To be posted
ItemExamSolutions
Practice midtermTo be postedTo be posted
MidtermTo be postedTo be posted
Practice finalTo be postedTo be posted
FinalTo be postedTo be posted