PHI 1101 Lecture Notes - Lecture 18: 5,6,7,8
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PHI 1101 Full Course Notes
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5. 5: some simple inferences justified with venn diagrams (read chapter and take notes b/c not done in class) We have more regions (add 5, 6, 7, 8) Always do universal propositions first (i. e. all ____, or no ____ ) Universale premises must be depicted before particular premises. When placing x s, do not introduce any assumptions. If two regions are open within the required region, place the x on the line separating them. Step 2: inspect the diagram to see whether the conclusion is also depicted.