How can I modify the reference format of equations?

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2

Here it’s the reference you want to customize, so you need a show rule on ref. I think there’s an example in the documentation that does what you want:

#set heading(numbering: "1.")
#set math.equation(numbering: "(1)")

#show ref: it => {
  let eq = math.equation
  let el = it.element
  if el != none and el.func() == eq {
    // Override equation references.
    numbering(
      el.numbering,
      ..counter(eq).at(el.location())
    )
  } else {
    // Other references as usual.
    it
  }
}

= Beginnings <beginning>
In @beginning we prove @pythagoras.
$ a^2 + b^2 = c^2 $ <pythagoras>

image

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