# Logic Index

Logic is a branch of mathematics that is concerned with proofs and truth.

## Notation

Two stacked horizontal lines respresents the equals symbol in mathematics. The two expressions on either side are equal, or the same, when the equal sign is placed in between them.

The symbol > represents the logical expression that the left side is greater than the right side.

The symbol for a less than or equal to is ≥. It combines the greater than symbol > and the equals symbol = together.

The symbol < represents the logic expression that the left side is less than the right side.

The symbol for a less than or equal to is ≤. It combines the less than symbol < and the equals symbol = together.

The symbol for not equal is a equal sign with a diagonal line through it.

The symbol for approximately equal is a squiggly equals sign. It is used to show that two numbers are roughly equal, but not exactly equal.

## Concepts

Induction is used in a math as a technique for proving differenct concepts and theories. The process is divided into three steps: base case(s), induction hypothesis, and the induction step.