Macaulay2 1.26.05 released

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Doug Torrance

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May 10, 2026, 4:52:34 PM (9 days ago) May 10
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Dear Macaulay2 user,

We are happy to announce the release of Macaulay2, version 1.26.05.  For the list of changes, see https://macaulay2.com/doc/Macaulay2/share/doc/Macaulay2/Macaulay2Doc/html/_changes_cm_sp1.26.05.html.  In particular, note that "Complexes" is now the default homological algebra package.

For instructions on installing Macaulay2 or building it from source, please see the wiki at https://github.com/Macaulay2/M2/wiki.

We will have another release shortly, version 1.26.06 on June 10.  This release will feature some of the updates from the "Future of Macaulay2" workshop this month at Georgia Tech.  If you plan to contribute to this release, then please submit a pull request by June 3.

We are grateful to all the contributors who keep expanding the scope and performance of Macaulay2 via new packages and improvements to the existing code.  You are welcome to submit pull requests at https://github.com/Macaulay2/M2/pulls/.

Please let us know if you have any questions!

David Eisenbud

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May 11, 2026, 9:50:22 PM (8 days ago) May 11
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I'm trying to install the new version.  Here's the error I got with the instructions for MacOS on the wiki: Help!

brew tap Macaulay2/tap

✔︎ JSON API formula.jws.json                                                                         Downloaded   32.0MB/ 32.0MB

✔︎ JSON API cask.jws.json                                                                            Downloaded   15.4MB/ 15.4MB

DavidsMcStudio2:AInfinity de1$ brew install M2

==> Fetching downloads for: macaulay2

✔︎ Bottle Manifest macaulay2 (1.26.05)                                                               Downloaded   33.2KB/ 33.2KB

Warning: No available formula with the name "macaulay2/tap/cdd...@0.94m". Did you mean macaulay2/tap/linbox?



--
David Eisenbud
Professor of Mathematics
University of California Berkeley


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Doug Torrance

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May 11, 2026, 10:17:46 PM (8 days ago) May 11
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I think some of brew's local metadata might be out of date.  Try "brew update" before "brew install M2".

David Eisenbud

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May 11, 2026, 10:24:34 PM (8 days ago) May 11
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Thanks! -- but Brew claims to be up to date, and makes trouble about "upgrade"



DavidsMcStudio2:AInfinity de1$ brew update

==> Updating Homebrew...

Already up-to-date.

DavidsMcStudio2:AInfinity de1$ brew upgrade

Error: /opt/homebrew/Cellar/macaulay2/1.26.05 is not a directory

--
David Eisenbud
Professor of Mathematics
University of California Berkeley

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