PHI 1101 Chapter Notes - Chapter 0: Venn Diagram, Universal Quantification, Existential Quantification

• School: University of Ottawa
• Department: Philosophy
• Course: PHI 1101
• Professor: N/ A

Document Summary

Some simple inferences justified with venn diagrams with the forms a and o) Contradictories happen when 1 premise is true and the other false (used. Proof by counterexample showing the falsity of a universal proposition by. The forms (cid:498)some a are b(cid:499) and (cid:498)some b are a(cid:499) are equivalent as they are using a counterexample symmetrical. Categorical syllogisms use 3 terms and therefore use 3 circles in the venn diagrams. Argument forms: barbara: using the word all in premises and conclusion, eee: using the word no in premises and conclusion, baroco: using the word all (premise) and some (premise) with. Some (conclusion), in this case there is both a universal premise and a particular one. Rule*: always diagram the universal premise first. You cannot introduce new assumptions into the diagram, if there are 2 possibilities, place the x on the circumference of the circle. Label all 8 regions and the u rectangle.