Added algebra.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2021-06-16 15:10:38
Author local date 2021-06-16 17:10:38 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2021-06-16 15:10:38
Committer local date 2021-06-16 17:10:38 +0200
Commit 802f7abab26e086efacef7665b94989d3f788f72
Tree 3b4b1bbe5a2ba3bffae4d61578f7f29b67680acf
Parent 704eecead7f67bd629aaec1e1e1b32af120406c3
Added algebra.
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