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Using xymatrix to get a commutative diagram $X=X$, I want to make the morphism identify as =, not \xymatrix {X\ar[r]^{id}X}.

How can I get this?

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    If I remember well, \ar@{=}[r]
    – egreg
    Commented Oct 21, 2017 at 6:24

1 Answer 1

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The standard arrow is ->, but you can change them quite easily:

\ar@{->}[r] % standard, can be input \ar[r]
\ar@{->>}[r] % double head
\ar@{=>}[r] % double stem and head
\ar@{=}[r] % double stem (equality)

and several others.

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  • I am really appreciated.
    – Jian
    Commented Oct 21, 2017 at 8:10
  • if I want to make the morphism is isomorphism not identity.This way seems can't achieve.How to chage?Thank you
    – Jian
    Commented Oct 21, 2017 at 10:46
  • @Sky There's nothing like that and for good reasons: a very long tilde is among the ugliest things I can imagine.
    – egreg
    Commented Oct 21, 2017 at 12:37

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