Proofs of the Algebraic Prerequisites
THE aim of this chapter is to collect all the missing proofs of the results in 3 Chap. 2. The chapter is divided into several sections, corresponding to 4 those of Chap. 2. Finally, Sect. 7.8 collects some proofs from Chaps. 4 and 6 5 too, considered as less crucial in favor of economy of presentation in the 6 chapters they originally belonged to.
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