I have a diagram that has only objects in (1,1), (1,2) and (2,1). I would like an arrow that goes from (2,1) to (1.2) going around (1.1). I do succeed in curving the arrow, but not to make it round enough to avoid crossing other objects in the diagram. Here is what I have:



&V\times Y\ar[l]_\varphi\ar[dl]^{\mathrm{pr}_1}\\



  • Welcome to teX.SX! You can highlight code in your post using back-ticks. To highlight code-blocks, either indent them by four spaces or use the {} on the gui. Sorry, I can't help with the actual question as I don't use xy.
    – user30471
    Mar 7, 2018 at 11:39
  • Why going around the upper left entry? I'd simply use \ar@/_1.5pc/[ur]_\psi
    – egreg
    Mar 8, 2018 at 8:37
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1 Answer 1


Here's a version using tikz-cd

\documentclass[border = 5pt]{standalone}



  \arrow[d, "p"']
  & V\times Y 
  \arrow[l, "\varphi"']
  \arrow[dl, "\mathrm{pr}_1"]
  \arrow[u, bend right, "\sigma"']
  \arrow[ur, rounded corners, "\psi", to path = { -- ([xshift = -4ex]\tikztostart.west) |- ([yshift = 3ex]\tikztotarget.north) [near end]\tikztonodes -- (\tikztotarget)}]


enter image description here

  • Thank you! I never used tikz (or tikz-cd) for the commutative diagrams, but it looks like I should
    – Tanda
    Mar 8, 2018 at 7:41
  • @Tanda It is very intuitive to use, specially if you're familiar with xy, plus it adds all the power of tikz for free
    – caverac
    Mar 8, 2018 at 7:52

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