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Let Var(M
plan) denote the variety generated by the class M
plan of planar modular lattices. In 1977, based on his structural investigations, R. Freese proved that Var(M
plan) has continuumly many subvarieties. The present paper provides a new approach to this result utilizing lattice identities.
We also show that each subvariety of Var(M
plan) is generated by its planar (subdirectly irreducible) members.
Dedicated to the memory of András P. Huhn
This research was partially supported by the NFSR of Hungary (OTKA), grant no. T 049433, T 48809 and K 60148. 相似文献
2.
Imre Patyi 《Journal of Mathematical Analysis and Applications》2009,356(1):211-214
We show that if A is a closed complex analytic subset of a Banach space X with an unconditional basis (e.g., X=?2) that has only normal crossings for singularities, then the structure and ideal sheaves of A are cohesive sheaves over X, and consequently, they are acyclic over any pseudoconvex open subset of X. 相似文献
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