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SUDARSHAN K SEHGAL and HANS ZA SSENHAUS
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1-lattices algebra appear application assume Auslander-Reiten basis block called character class group commutative complex component conjecture connected consider contains corresponding cover cyclic defined definition denote described determined diagram dimension direct element equivalent exact sequence example exists extension fact factor field finite groups Fröhlich function functor Galois give given Grothendieck group G group rings Hence homomorphism ideal implies indecomposable induced infinite integral integral representations irreducible isomorphism lattice Lemma locally Math matrix maximal order methods minimal modules multiplication natural norm normal obtained periodic preprojective prime problem projective proof properties Proposition prove quadratic quaternion quiver rank rational Reiner Remark representation representation type represented respect restriction result root simple space groups split structure subgroup Suppose Theorem theory trivial unique units