A sufficient condition for certain semigroups to be free
نویسندگان
چکیده
منابع مشابه
A New Sufficient Condition for a Digraph to Be Hamiltonian
In 2] the following extension of Meyniels theorem was conjectured: If D is a digraph on n vertices with the property that d(x) + d(y) 2n ? 1 for every pair of non-adjacent vertices x; y with a common out-neighbour or a common in-neighbour, then D is Hamiltonian. We verify the conjecture in the special case where we also require that minfd + (x)+d ? (y); d ? (x)+d + (y)g n ?1 for all pairs of ve...
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ژورنال
عنوان ژورنال: Journal of Algebra
سال: 1982
ISSN: 0021-8693
DOI: 10.1016/0021-8693(82)90010-2