PHIL 1102 Chapter Notes - Chapter 4.3: Syllogism, Venn Diagram, Existential Fallacy
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4. 3 venn diagrams and the modern square of opposition. Existential import: concept that the subject terms denote actual. All pheasants are birds -> implies existence of pheasants. No pine trees are maples -> implies existence of pine trees. All satyrs are vile creatures -> does not imply existence of satyrs. The first two have existential import while the last does not because satyrs do not actually exist. All trucks are vehicles -> does not imply the existence of trucks. No daisies are roses -> does not imply the existence of roses. The aristotelian standpoint differs from the boolean in regard to (cid:840)a and e - universal(cid:841) propositions. Both are identical in regards to particular (cid:840)i and. All s are p = no members of s are outside of p. No s are p = no members of s are inside of p. Some s are p = at least one s exists that is a p.
