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.
A first course in abstract algebra with applications , 3rd Ed., Upper Saddle River, New Jersey 07458, Pearson Prentice Hall 2006
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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.