Question
Let n be a positive integer and let Sn be any set with |Sn| = n. Define Dn to be the digraph with V (Dn)
Let n be a positive integer and let Sn be any set with |Sn| = n. Define Dn to be the digraph with V (Dn) = P(Sn), the set of all subsets of Sn, where (X, Y ) A(Dn) if and only if X contains Y properly as a subset. Prove that D has a unique source
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Differential Equations With Involutions
Authors: Alberto Cabada, F Adrián F Tojo
1st Edition
9462391211, 9789462391215
