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Oct 11, 2014 at 2:46 comment added Sh.M1972 Thank you for the reference. Just can't understand one point: the theorem of Birkhoff concerns all finite algebras of finite type and as I see it is published 1935. In the comments Benjamin Steinberg says that it is proved for finite semigroups by Mark Sapir (may be on 1988). I can't download the paper of Sapir, so I don't know actually what he did.
Oct 11, 2014 at 2:41 vote accept Sh.M1972
Oct 10, 2014 at 22:39 review First posts
Oct 10, 2014 at 22:44
Oct 10, 2014 at 22:39 history answered user 59363 CC BY-SA 3.0