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.
Cubic algorithm to compute the Dynkin type of positive defini te quasi- Cartan matrices, Fundamenta Informaticae 2018
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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.