Library

Training problems with hints, and solutions.

• Sum Parity InvariantDifficulty 1
• Divisible Difference ProcessDifficulty 1
• Powers Mod 3 PatternDifficulty 1
• Parity invariant warmupDifficulty 2
  invariantsparity
• Smallest Counterexample PrincipleDifficulty 2
• Equal RemaindersDifficulty 2
• Coloring InvariantDifficulty 2
• A modular invariant warmupDifficulty 3
  modular arithmeticinvariants
• A pigeonhole principle warmupDifficulty 3
  pigeonhole principlecombinatorics