. . . . . "over principal ideal domains, flat modules are exactly torsion-free modules" . . . . . . . "principal ideal domain - Algebraic structure" . "flat module - algebraic structure in ring theory" . "torsion-free module - module over a ring such that zero is the only element annihilated by a regular element of the ring" . "Uni Marx" . "RSA" . "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnNLN3ua2JspoEHU8IclouceneexsknOLLz5ONfKbPFteR1TwYn5QQpQgpw/9QBi2xa6EexXYFUJCnol7mEtzmE1+fQO5NKc5MYL/HZxmYlhCCPkuhpe0J9po8C1k8lBOoa0BwoQb1EHlQf4qpaPjgc2jCIXwIkPHiMvLMba/vVQIDAQAB" . "lTDlLQzQEeTePcN4KVDSiiuNPrnfFw6UMK85TabmRZKrFKNrgjd8l0h77IrkUuPmdsnXYcZ5y2zT/ejShPHnAGwXf/QOoXK1Qf3D02F15jxPAs72wtc3lr9LVYRugFaASdZF6UPZlR1wWmvPkDcAsNbCmcuBidF4ERpDGRXMhkk=" . . . "2024-04-21T18:56:34.886Z"^^ . . . . . . . . .