Cancellable elements in the lattice of overcommutative semigroup varieties

Vyacheslav Yu. Shaprynskii, Boris M. Vernikov

备注：: 8 pages. Compared with the previous version, we fix a number of typos and updated the item [6] in References. arXiv admin note: text overlap with arXiv:0909.4388

英文摘要：

We completely determine all cancellable elements in the lattice OC of overcommutative semigroup varieties. In particular, we prove that an overcommutative semigroup variety is a cancellable element of the lattice OC if and only if it is a neutral element of this lattice

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