A Text-Book of Deductive Logic for the Use of Students
A Text-Book of Deductive Logic for the Use of Students
Ray, Prasanta K
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J (&) Every animal is either vertebrate or invertebrate. ( (e) An animal is either vertebrate or invertebrate. ( (a) Substance is either knowable or unknowable. 4. J (&) A substance is either knowable or unknowable. ( (c) All substances are either knowable or unknowable I A body is either solid or fluid. I This body is either solid or fluid. I Every body is either solid or fluid. I All bodies are either solid or fluid. § 9. Additional Forms of Immediate Inference. Given a proposition * A *— .^ ...B * with * A' and * B ' as its subject and predicate respectively, the propositions immediately inferred from it will be in one or other of the following forms : — 1. * A »— » not-B,' with * A * and * not-B ' as subject and predi- cate. 2. * Not-A »— » B/ with * not-A ' and * B ' as subject and predi- cate. 3. * Not-A *—» not-B,' with * not-A* and * not-B' as subject and predicate. 4. * B ^-. A,' with * B ' and * A ' as subject and predicate. 6. * Not-B »— » A,' with * not-B ' and * A ' as subject and predi- cate.
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