Rethinking the real line #SoME3

The Intuition behind the Double-And-Add / Square-And-Multiply Algorithm (Also Just a Fun Puzzle!)

ADFGVX Cipher: Encryption and Decryption (Updated)

Lehmer Factor Stencils: A paper factoring machine before computers

Studying Apollonian Circle Packings using Group Theory

The modular inverse via Gauss not Euclid

The extended Euclidean algorithm in one simple idea

ADFGVX Cipher: Encryption and Decryption (OLD VERSION: SEE NEW VERSION LINK BELOW)

Cryptanalysis of Vigenere cipher: not just how, but why it works

The Euclidean Algorithm: How and Why, Visually

Greatest common divisor and least common multiple: building blocks

Modular Arithmetic: Multiplication in Motion

Modular Arithmetic: Addition in Motion

Modular Arithmetic: In Motion

Modular Arithmetic: Under the Hood

Modular Arithmetic: User's Manual

Intro to LaTeX for beginning math majors

Abelian sandpile animation: toppling of an odometer of integral linear growth

Abelian sandpile animation: toppling of an odometer of integral quadratic growth

Abelian sandpile animation: toppling of an odometer of rational linear growth

Abelian sandpile animation: toppling of an odometer of rational quadratic growth

Abelian sandpile animation: toppling of an odometer of rational quadratic growth

The Intuition Behind Proof by Induction

The Dystopian Perspective on Logical Negation

Anatomy of a proof: if n is even, then n squared is even

Sets and their elements

What is an "if-then" statement?