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- W3086119435 abstract "A binary relation on a finite set is called a Hall relation if it contains a permutation of the set. Under the usual relational product, Hall relations form a semigroup which is known to be a block-group, that is, a semigroup with at most one idempotent in each $mathrsfs{R}$-class and each $mathrsfs{L}$-class. Here we show that in a certain sense, the converse is true: every block-group divides a semigroup of Hall relations on a finite set." @default.
- W3086119435 created "2020-09-21" @default.
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- W3086119435 date "2020-09-11" @default.
- W3086119435 modified "2023-09-27" @default.
- W3086119435 title "Block-groups and Hall relations" @default.
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