combinatorics 15

• Generating functions Feb 25, 2025
• Counting in two different ways Feb 24, 2025
• Counting the complement Feb 23, 2025
• Counting via bijections Feb 22, 2025
• Counting Feb 21, 2025
• Grouping in pairs Feb 20, 2025
• Arrange in order Feb 20, 2025
• Extremal principle Feb 19, 2025
• Pigeonhole principle Feb 18, 2025
• Invariance principle Feb 17, 2025
• Inclusion-exclusion principle Feb 16, 2025
• Induction Feb 15, 2025
• Auxiliary configuration Feb 14, 2025
• Coloring proofs May 17, 2024
• Warm Up (Combinatorics) May 15, 2024