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Academic help online
Let φ: B → S be a graded epimorphism of standard K-algebras, where K is an infinite field. If dim(B) = dim(S), prove r(B) ≥ r(S) ? Let G be a graph with n vertices and let A be its incidence matrix. Prove that if rank(A) = n and A is an independent set of G, then the sets are proper faces of the edge cone.

Academic help online

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