Begin with Lemma 28.1, continue through the two corollaries of Theorem 28.1, and in
Chapter 28, Problem 28.11(choose chapter or problem)
Begin with Lemma 28.1, continue through the two corollaries of Theorem 28.1, and in eachcase replace D by an ordered commutative ring R with unity. (See 28.10 for thedefinition of ordered commutative ring.) Which of the lemmas, corollaries, and theorems arestill true?
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