# ABCDEFGHIJKLMNOPQRSTUVWXYZ

#### Inequality symbols

The symbols used in an inequality: less than $(<)$, greater than $(>)$, less than or equal to ($$\le$$), and greater than or equal to ($$\ge$$).

#### Index

$n$ is the index in $$\sqrt[n]{a}$$.

#### Independent variable

The input of a function.

#### Inconsistent system

A system of equations that have no solution. The slopes of the lines are equal.

#### Imaginary unit i

The square root of -1. $$i = \sqrt { – 1}$$

#### Imaginary part

The part of a complex number that is added to the real part. $bi$ in $a + bi$.

#### Imaginary number

When $$b \ne 0$$ in a complex number, $a + bi$.

#### i-form

The form used when writing the square root of a negative number using the imaginary unit $i$.

#### Identities

A relationship equating one expression to another.

Glossary: I

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