## Introducing the Factorial: the Exclamation Mark of Math

What is a factorial, and how is the exclamation point used in mathematics? Learn more about gamma functions and more.

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## Introducing Math Symbols for Union and Intersection

Understanding the symbols we use in complex math problems is the first step towards understanding the math problems before us.

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## One Non-Bayesian Approach to the Two Envelope Paradox

The “Two Envelope Paradox” is an intriguing puzzle that some prefer to solve using the logic of Bayesian probability. Can we avoid Bayes with a classic solution or a realistic experiment?

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## A Brief Guide to the Euclidean Postulates Found in Euclid’s Elements

Euclid’s axioms and postulates, intended to be self-evident, are sufficient to prove the many propositions he made in Elements.

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## Elements of Geometry: A Brief Guide to the Euclidean Axioms

Euclidean geometry is based on Euclid’s axioms and postulates. What do the Euclidean axioms say, and why are they so important in math?