How to align terms vertically in math mode?

Questions
,
1

Hello!
I would like to ask for a better alternative of an idiom I’ve been using.

To create the definition of a map with terms and arrows aligned as follows,

K * A * N -> G
(k, a, n) |-> k a n

I often use mat(delim: #none, ...)

$
  mat(
      delim: #none,
      K times A times N, ->, G;
      (k, a, n), mapsto, k a n;
   )
$

As you can see, it has some issues.

  1. Specifying delim: #none is rather verbose.
  2. This abuses mat for different purpose.
    I wonder if there is more canonical or better way to achieve the alignment in math mode.
    Thanks in advance!
2

Hello. Welcome to the forum. There is a section about alignment in math mode: Math – Typst Documentation.

$
  K times A times N & -> & G \
  (k, a, n) & |-> & k a n
$

image

But if you need the “cell” center alignment, I think mat() is your best bet. But you can simplify your example with a substitution:

// matrix align
#let malign = math.mat.with(delim: none)

$
  malign(
    K times A times N, ->, G;
    (k, a, n), |->, k a n;
  )
$
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