I would like to create a two-lined entry in my xymatrix. In the attached picture, I want to split the direct sum into two lines.

I tried array but this didn't work.

Thanks !


  • 2
    What you try so far? – Zarko Jul 21 '19 at 18:29

Just brace the array.



  {\begin{array}{@{}c@{}}K_0(M_p\oplus M_q)\oplus{}\\ K_0(C([0,1]),M_p\oplus M_q))\end{array}}
  \ar[r] & \\
  K_0(Z_{pq})  \ar[u]^{K_0(\pi_1)\oplus K_0(\pi_2) } \\


enter image description here

| improve this answer | |
  • My sincere welcome. I have deleted, correctly, my answer. Your answer is the best. – Sebastiano Jul 22 '19 at 10:35

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