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• Attach

Attach

Subscript, superscripts, and limits.

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.

If you want the base to stretch to fit long top and bottom attachments (for example, an arrow with text above it), use the stretch function.

Example

$ sum_(i=0)^n a_i = 2^(1+i) $

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.

Functions

attachElement

Element functions can be customized with set and show rules.

A base with optional attachments.

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

base

content

Required Positional

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

scriptsElement

Element functions can be customized with set and show rules.

Forces a base to display attachments as scripts.

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

body

content

Required Positional

Positional parameters are specified in order, without names.

The base to attach the scripts to.

limitsElement

Element functions can be customized with set and show rules.

Forces a base to display attachments as limits.

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

body

content

Required Positional

Positional parameters are specified in order, without names.

The base to attach the limits to.

inline

bool

Settable

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

Whether to also force limits in inline equations.

When applying limits globally (e.g., through a show rule), it is typically a good idea to disable this.

Default: true

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