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We describe the structure of module categories of finite dimensional algebras over an algebraically closed field for which the cycles of nonzero nonisomorphisms between indecomposable finite dimensional modules are finite (do not belong to the infinite Jacobson radical of the module category). Moreover, geometric and homological properties of these module categories are exhibited.doi:10.1007/978-3-642-39485-0_10 fatcat:crah3rjhxvebrkaq5hyvfu75o4