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• Attach

Attach functions

Subscript, superscripts, and limits.

The attach function backs the $a_b^c$ syntax that adds top and bottom attachments to a part of an equation. Attachments can be displayed either as sub/superscripts, or limits. Typst automatically decides which is more suitable depending on the base, but you can also control this manually with the scripts and limits functions.

attach functionElement

Element functions can be customized with set and show rules.

A base with optional attachments.

Example

// With syntax.
$ sum_(i=0)^n a_i = 2^(1+i) $

// With function call.
$ attach(
  Pi, t: alpha, b: beta,
  tl: 1, tr: 2+3, bl: 4+5, br: 6,
) $

Syntax

This function also has dedicated syntax for attachments after the base: Use the underscore (_) to indicate a subscript i.e. bottom attachment and the hat (^) to indicate a superscript i.e. top attachment.

Parameters

Parameters are the inputs to a function. They are specified in parentheses after the function name.

base

content

RequiredPositional

Positional parameters are specified in order, without names.

The base to which things are attached.

t

none or content

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The top attachment, smartly positioned at top-right or above the base.

You can wrap the base in limits() or scripts() to override the smart positioning.

Default: none

b

none or content

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The bottom attachment, smartly positioned at the bottom-right or below the base.

You can wrap the base in limits() or scripts() to override the smart positioning.

Default: none

tl

none or content

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The top-left attachment (before the base).

Default: none

bl

none or content

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The bottom-left attachment (before base).

Default: none

tr

none or content

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The top-right attachment (after the base).

Default: none

br

none or content

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

The bottom-right attachment (after the base).

Default: none

scripts functionElement

Element functions can be customized with set and show rules.

Force a base to display attachments as scripts.

Example

$ scripts(sum)_1^2 != sum_1^2 $

Parameters

Parameters are the inputs to a function. They are specified in parentheses after the function name.

body

content

RequiredPositional

Positional parameters are specified in order, without names.

The base to attach the scripts to.

limits functionElement

Element functions can be customized with set and show rules.

Force a base to display attachments as limits.

Example

$ limits(A)_1^2 != A_1^2 $

Parameters

Parameters are the inputs to a function. They are specified in parentheses after the function name.

body

content

RequiredPositional

Positional parameters are specified in order, without names.

The base to attach the limits to.

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