By B. Loewe (ed.)

This quantity is either a tribute to Ulrich Felgner's study in algebra, common sense, and set idea and a powerful examine contribution to those components. Felgner's former scholars, associates and collaborators have contributed 16 papers to this quantity that spotlight the team spirit of those 3 fields within the spirit of Ulrich Felgner's personal learn. The reader will locate first-class unique learn surveys and papers that span the sector from set thought with no the axiom of selection through model-theoretic algebra to the maths of intonation.

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For any class 7 of rings, the following conditions are equivalent: I. 7 is a radical class; II. A zs in 7; III. 7 satisfies condition (Rl), /las i/ie inductive property and is closed under extensions. Proof: I =$• III. 4 gives us the implication. Ill =>• II. We must prove (R2). Assume then that A is a ring such that for every A-&B ^ 0 there exists a C < B such that 0 ^ C 6 7, and that A itself is not in 7. Because we have the inductive property, we can use Zorn's Lemma and obtain an ideal / of A, maximal with respect to being in 7.

A class 7 of rings is a radical class if and only if (a) 7 is homomorphically closed, (b) 7 has the inductive property, (c) 7 is closed under extensions. 5. For any class 7 of rings, the following conditions are equivalent: I. 7 is a radical class; II. A zs in 7; III. 7 satisfies condition (Rl), /las i/ie inductive property and is closed under extensions. Proof: I =$• III. 4 gives us the implication. Ill =>• II. We must prove (R2). Assume then that A is a ring such that for every A-&B ^ 0 there exists a C < B such that 0 ^ C 6 7, and that A itself is not in 7.

I) The ring T is not simple, because H = {t e T | t is finite valued} is an ideal in T and 0 j^ H ^ T, as one can readily verify. (ii) If t & H is any nonzero element, then to every finite dimensional subspace W of V there exists an element t* in the principal ideal (t) which Copyright © 2004 by Marcel Dekker, Inc. 13 General Fundamentals is a projection of V onto W . For the proof we apply induction. Suppose first that dimW 7 = 1 and W = Dw. Moreover, let {tvi, . . :tvn} be a basis of the image space tV.