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.
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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.