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.
Tubes in derived categories and cyclotomic factors of the Coxeter polynomial of an algebra , Journal of Algebra 2014
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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.