In: Advanced Math
Let T be a connected graph and z ∈ℤ between the closed interval of 1 and the least degree of a vertex in T. Let a z - matching be a A ⊆ E s.t. there aren’t vertices with more than z edges in A. Let a z - cover be a X ⊆ E s.t. all vertices belong to at least z edges in X.
Let:
δ (T) = Max {|A| : A is a z - matching}
μ (T) = Min {|X| : X is a z - cover}
Show that δ (T) + μ (T) = zn