Mar 24, 2025 System of equations Mar 17, 2025 Integer divisibility Mar 17, 2025 Lagrange interpolation Mar 17, 2025 Crossing the $$ x $$-axis Mar 08, 2025 Roots of unity Mar 07, 2025 Size of the roots Mar 06, 2025 Finite differences Mar 06, 2025 Differentiation and multiple roots Mar 05, 2025 Viete's relations Feb 25, 2025 Generating functions Feb 24, 2025 Counting in two different ways Feb 23, 2025 Counting the complement Feb 22, 2025 Counting via bijections Feb 21, 2025 Counting Feb 20, 2025 Grouping in pairs Feb 19, 2025 Extremal principle Feb 18, 2025 Pigeonhole principle Feb 17, 2025 Invariance Feb 16, 2025 Inclusion-exclusion principle Feb 15, 2025 Induction Feb 14, 2025 Auxiliary configuration Jul 17, 2024 Rational and irrational numbers Jul 05, 2024 Arithmetic progressions Jun 23, 2024 More on Polynomials Jun 22, 2024 Binomial theorem Jun 21, 2024 Functional equations Jun 19, 2024 Growth of Polynomials Jun 18, 2024 Quartics Jun 17, 2024 Cubic polynomials Jun 16, 2024 Quadratic polynomials Jun 15, 2024 Polynomials Jun 14, 2024 Invariance principle Jun 13, 2024 $$ a^3+b^3+c^3 - 3abc $$ Jun 12, 2024 Warm Up May 17, 2024 Coloring proofs May 15, 2024 Warm Up