Published onNovember 26, 2014What Is a Proper Divisor?number-theorymathematicsDivisors of a number excluding itself.
Published onNovember 5, 2014What Is a Triangular Number?number-theorymathematicsA number formed by arranging dots in a triangle shape.
Published onOctober 21, 2014What Is Proof by Contradiction?logicmathematicsA proof method that assumes the opposite first and shows its falsehood to reveal the truth.