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The finite basis problem for additively idempotent semirings of order four, I

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arxiv 2407.15342 v3 pith:5MRFKDAR submitted 2024-07-22 math.GR

classification math.GR
keywords additivelybasisfiniteidempotentproblemsemiringsadditivealgebras
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We study the finite basis problem for 4-element additively idempotent semirings whose additive reducts are semilattices of height 1. Up to isomorphism, there are 58 such algebras. We show that 49 of them are finitely based and the remaining ones are nonfinitely based.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The finite basis problem for additively idempotent semirings that relate to S_7

    math.GR 2025-01 accept novelty 7.0 of 10

    The variety generated by the 3-element semiring S7 has exactly six finitely based subvarieties and contains a continuum of subvarieties, so S7 is of type 2^aleph0.

  2. The finite basis problem for additively idempotent semirings of order four, II

    math.GR 2025-01 conditional novelty 6.0 of 10

    Exactly one of the 93 four-element additively idempotent semirings with quasi-antichain additive reduct, namely S(4,435), is nonfinitely based; the other 92 are finitely based.

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