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What was the first package for typesetting commutative diagrams in Latex and when was it made available?

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    you can typeset commutative diagrams in the picture environment, which has been available as long as latex, but isn't a "package" – David Carlisle Aug 1 '14 at 8:48
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    Possibly amscd, based on the features available in AMS-TeX, but it just produced rectangular diagrams. – egreg Aug 1 '14 at 9:06
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You can find a comparison between packages for commutative diagrams in a very nice paper by Gabriel Vicente Feruglio on TUGboat, issued in 1994.

According to the bibliography, the first available package (besides using directly picture mode) was the one by John Reynolds, diagmac.sty issued in 1987 and still available as diagmac2 (some patches were introduced by Bob Tennent in order to make the package use pict2e facilities).

The porting of AMS-TeX to LaTeX pushed several people to do the switch and this prompted the development of the other packages described in Feruglio's paper.

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