Apr 20, 2025 Chinese remainder theorem Apr 16, 2025 System of equations Apr 09, 2025 Binomial coefficients Apr 07, 2025 Quadratic polynomials Apr 07, 2025 Using identities Apr 07, 2025 Induction Apr 07, 2025 Cubic polynomials Apr 04, 2025 Telescoping Apr 03, 2025 Inequalities 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 Jan 10, 2025 INMOTC 2025 (MP region), Algebra