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What is the relation between the number syntactic congruence classes, and the number of Nerode relation classes?

dec 17 11 at 6:22 MathOverflow♦ 1●2●3

 
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To what extent MSO = WS1S, when adding relations?

jul 18 10 at 0:55 Theo Johnson-Freyd 22.3k●2●27●110

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Vocabulary on monoid periodicity

sep 21 10 at 22:52 Mark Sapir 27.6k●2●57●118