SR_6 generates a limit variety V(SR_6) with a four-element chain subvariety lattice, establishing it as nonfinitely based while all proper subvarieties are finitely based.
Preprint, arXiv:2603.00015 (2026)
2 Pith papers cite this work. Polarity classification is still indexing.
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A 4-element additively idempotent semiring whose additive reduct has two minimal elements and two coatoms has no finite basis for its identities.
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A new limit variety of additively idempotent semirings
SR_6 generates a limit variety V(SR_6) with a four-element chain subvariety lattice, establishing it as nonfinitely based while all proper subvarieties are finitely based.