Higher Algebra (2 Volumes) by Helmut Hasse

By Helmut Hasse

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This implication has 1. 1. Rings, Fields, Integral Domains 32 to be qualified. True, the basic problem of algebra, as formulated in the introduction, is indifferent to whether it deals with a domain B or a B' isomorphic to B. However, if the isomorphic domains B and B' are both subdomains of another domain B , then a distinction between them arises in a natural way, namely, their elements are distinct (with respect to considerations inside B ) in virtue of the individuality of the elements of B (cf.

Definition 15. If 1, are any (finite or infinite number of) subgroups of a group (&S, then the intersection of all subgroups of CAS containing as subgroups is called the 2 Cf. the statement about numbering in footnote 5 to Theorem 7 [26] . 7. 2' ... or also the g),otcp coviposed from X21' 522' ... Definition 16. If an equivalence relations = in a group C6 satisfies not only the conditions Section 2, (a). (n). but also: (1) Ai = A2, Bi - B2 implies Al B1= A2 B_. then we call it a congruence relation in U and the classes thereby determined the residue classes of U relative to it.

In CSS, by (2) there exist in ( elements EA, EB, ... , such that ABA =A, BBB=B.... FAA=A, FHB=B,... Furthermore, to every pair of elements A, B of CSS, by (2) elements C and D can be chosen such that AC= B, DA=B. By (1) this implies that 1 These designations refer to the position of the quotients B1, B2. 6. Definition of Groups 59 BEA = (DA)EA = D(AEA) = DA = B = BEB, FAB = F4(AC) = (F4A)C = AC = B = FBB. therefore E,1= EB, FA = FB on account of the uniquenes- in (2). Hence EA, EB, ... are all the same element E: FA.

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