Establishes equivalence between strong Gram congruence and (weak Gram congruence + same Coxeter polynomial) for connected non-negative unit forms of type A_r, completing their classification.
The Theory of Matrices , V ols.1 and 2, Chelsea Publishing Company, New Y ork, N.Y
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A strong Gram classification of non-negative unit forms of Dynkin type A
Establishes equivalence between strong Gram congruence and (weak Gram congruence + same Coxeter polynomial) for connected non-negative unit forms of type A_r, completing their classification.