This is the left distributive law, which shows that multiplication can be distributed over addition from the left. While mathematically obvious, in Lean you must prove it from scratch using only ...

A man using a meat cleaver to kill his wife and daughter and wound his son-in-law in an apartment in Fairfax County, Virginia, was stopped when police shot and killed him, authorities say. A ...

In this "Improve Your Grades in a Short Time" math course, Chapter 2 is "Algebraic Expressions." From this lecture, we enter the second half, where we will review the distributive law and learn about ...

This summer, battle lines were drawn over a simple math problem: 8 ÷ 2(2 + 2) = ? If you divide 8 by 2 first, you get 16, but if you multiply 2 by (2 + 2) first, you get 1. So, which answer is right?

Intuitionistic logic, i.e. logic without the principle of excluded middle (P ∨ ¬ P P \vee \neg P), is important for many reasons. One is that it arises naturally as the internal logic of toposes and ...