Autumn 2025: The notes (hand-written notes in Russian):

• 1. Goat, grass and cabbage: Notes and Turkish Lullaby (3-minutes long cartoon).
• 2. Where to dig a well?: Notes and Combodian Lullaby.
• 3. Illumination Problem: Notes and Lithuanian Lullaby.
• 4. Four Colour Theorem: Notes and Jewish Lullaby.

Resources:

• 1: Kempe's Universality Theorem:
  • "Linkage that signs your name" by Yang Liu. .
  • "Kempe's Universality Theorem" explained by Erik Demaine.
• 2: Geometric loci:
  • Geometric Loci by A. Savin, Kvant magazine, 1995 (in Russian).
• 3: Illumination problem:
  • The Illumination Problem - Numberphile video with Howard Masur.
  • Illuminating a plane by projectors by V. Galperin and G. Galperin, Kvant magazine, 1995 (in Russian).
• 4: Four Colour Problem:
  • p.290-291 in "What is Mathematics?" by R.Courant and H.Robbins (Russian translation). .
  • Chapter 43 in "Mathematical Puzzles and Diversions" by Martin Gardner (Russian translation).