# Symbols:I

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## Roman Numerals

$\mathrm I$ or $\mathrm i$

The Roman numeral for $1$.

Its $\LaTeX$ code is \mathrm I  or \mathrm i.

## Imaginary Part

$\Im \left({z}\right)$ or $\operatorname{Im} \left({z}\right)$

The imaginary part of a complex number $z$.

The $\LaTeX$ code for $$\Im \left({z}\right)$$ is \Im \left({z}\right) .

The $\LaTeX$ code for $$\operatorname{Im} \left({z}\right)$$ is \operatorname{Im} \left({z}\right) .

### Variants

Variants of $\operatorname{Im} \left({z}\right)$ and $\Im \left({z}\right)$ that can often be found are:

$\operatorname{\mathscr I} \left({z}\right)$
$\operatorname{im} \left({z}\right)$

The $\LaTeX$ code for $$\operatorname{\mathscr I} \left({z}\right)$$ is \operatorname{\mathscr I} \left({z}\right) .

The $\LaTeX$ code for $$\operatorname{im} \left({z}\right)$$ is \operatorname{im} \left({z}\right) .

## Image

$\operatorname{Im}$

Denotes the image of a relation or the image of a mapping.

The $\LaTeX$ code for $$\operatorname{Im} \left ({\mathcal R}\right)$$ is \operatorname{Im} \left ({\mathcal R}\right) .