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Is it possible to use the xymatrix command to make a spectral sequence ? Since xymatrix has all the arrows, what I am really asking is are there commands that will enclose the entries in a lattice of boxes. A simple sample would be ideal.

Edit: An example of what I am trying to achieve can be seen on the first page of this paper:

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I have no idea as I don't use xymatrix but: 1) for general commutative diagrams, there is the tikz-cd package; 2) there is a sseq package dedicated to typesetting all sorts of spectral sequences. – Bernard Jul 15 '14 at 16:47
Thanks, I am trying to accomplish what I want with the packages that I have been using. – Rene Schipperus Jul 15 '14 at 16:49
A pointer to an example of what you want to achieve would be helpful. – egreg Jul 15 '14 at 19:49
@egreg: Thanks, good idea, I have edited. – Rene Schipperus Jul 15 '14 at 21:56
Thanks for the PDF. – Sigur Jul 15 '14 at 22:45

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