How to indent section of text

How can I indent an entire section of text?

For example

The following is indented:
#h(20pt) First line \
#h(20pt) Second line

#h(20pt) $ "equations should also work" $

Normal indentation again

but without having to insert the #h(20pt) every time.

Is that possible in an easy way?

Have a look at Paragraph Function – Typst Documentation, indentation.

The following is indented:

#set par(first-line-indent: 20pt, hanging-indent: 20pt)

First line #lorem(100)

Second line

$"inline equations should also work"$
$ "block equations are handled separately" $

#set par(first-line-indent: 0pt, hanging-indent: 0pt)

Normal indentation again

For this it only works on the first line

  #set par(first-line-indent: 20pt, hanging-indent: 20pt)

  Minimierung von $tilde(f)^l_alpha_l$ mit
  $
    tilde(f)^l_alpha_l (x) = f(x) + alpha_l/2 (uv(x)^l - x)^T (ov(x)_l - x)
  $ 
  mit $x^l = [uv(x)^l, ov(x)^l]$ und $alpha_l >= max {0, -min_(x in X^l) lambda_min (x)}$

  #set par(first-line-indent: 0pt, hanging-indent: 0pt)

It does work when I add a / after the equation, but then the next line is pushed to the next page (it’s right at the end of the page), without the / it fits beneath the eqaution.

This is a mix of problems:

  1. first-line-indent is ignored for the “first” paragraph after certain elements (headings and block equations)
  2. If you add a \ after the equation, this will make the following paragraph start with a blank line (and the line with text on it then follows hanging-indent.
    This means that if there isn’t a pagebreak there, it will add additional vertical whitespace.
  3. Block equations are not affected by either indent, but also unaffected by placing a #h(20pt) infront of them (this h will be on its own line and not affect the equation)
Code for example image
#[
  #set par(first-line-indent: 20pt, hanging-indent: 20pt)

  The first paragraph always has a `first-line-indent` of 0.
  #lorem(10)
  
  Later paragraphs respect `first-line-indent`. #lorem(10)
  
  Minimierung von $tilde(f)^l_alpha_l$ mit
  $
    tilde(f)^l_alpha_l (x) = f(x) + alpha_l/2 (bold(x)^l - x)^T (bold(x)_l - x)
  $
  mit $x^l = [bold(x)^l, bold(x)^l]$ und $alpha_l >= max {0, -min_(x in X^l) lambda_min (x)}$.
  This is handled as a "first paragraph" because it follows a block equation.
]

Normal indent. #lorem(20)

#lorem(20)
$
  tilde(f)^l_alpha_l (x) = f(x) + alpha_l/2 (bold(x)^l - x)^T (bold(x)_l - x)
$
#lorem(20)


As an alternative solution, you might want to use Padding Function – Typst Documentation instead. This will also move the block equation to the right:

#pad(left: 20pt)[  
  Minimierung von $tilde(f)^l_alpha_l$ mit
  $
    tilde(f)^l_alpha_l (x) = f(x) + alpha_l/2 (bold(x)^l - x)^T (bold(x)_l - x)
  $
  mit $x^l = [bold(x)^l, bold(x)^l]$ und $alpha_l >= max {0, -min_(x in X^l) lambda_min (x)}$.
]

Normal indent. #lorem(20)
$
  tilde(f)^l_alpha_l (x) = f(x) + alpha_l/2 (bold(x)^l - x)^T (bold(x)_l - x)
$

(If you don’t want the very first line to be indented, you can add a #h(-20pt):

#pad(left: 20pt)[
  #h(-20pt)
  Minimierung ...

)

Have a look at How to have first line indent in a new paragraph after a math block? - #2 by miles-1