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Square matrix with entries in a commutative ring

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Reference no: EM131587421

Question: Let U be a square matrix with entries in a commutative ring R. Prove that U is unimodular if and only if U is invertible? Let G be a graph with incidence matrix A and N = ker(A) ⊂ Qq. Give an example to show that the set of circuits of N does not determine the presentation ideal of K[G]

Reference no: EM131587421

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