# SelectedanswerslogicI&II - PHIL 100 0203,0205,0207...

This preview shows pages 1–3. Sign up to view the full content.

1 PHIL 100 §§0203,0205,0207 Selected Answers Logic Exercises I,II I.a) Answered in detail in Handout I see page 5-6 M S P M S I.b) “All horses are knaves, so it follows that , since some pintos are horses, some knaves are not pintos.” Premise (major) P Conclusion “so it follows that…” (conclusion indicator) “since…” (premise indicator) A premise is stuck between the conclusion indicator and its conclusion (underlined) P-term: Pintos S-term: Knaves M-term: Horses Standard Syllogistic form: Some P are M All M are S Some S are not-P IAO 4 mood and figure Validity Rule Justification A OK, neither major nor minor premises are negative B NO Pass- Conclusion in particular-negative, but neither premises are negative C OK, M is distributed in minor premise (since it’s the subject of an A-form) D NO Pass- P is distributed in conclusion (it’s the predicate of an O-form) but P is not distributed in major premise (it’s the subject of an A-form) E OK by default, only minor premise is universal (both premises must be universal for rule to take effect.) I.c) Answered in detail in Handout I (September 9 & 16), see page 6 Id.) “Some golf clubs are woods, and some golf clubs are irons, so [no irons are woods].” Conclusion (bracketed after indicator ‘so’): S: Irons P: Woods M: Golf clubs

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
2 Standard Syllogistic form: Some M are P Some M are S No S are P IIE 3 mood and figure Validity Rule Justification A OK, neither major nor minor premises are negative B NO Pass- Conclusion in universal-negative, but neither premises are negative C NO Pass- M isn’t distributed in either premises (M is the subject of an I- form) D NO Pass- P is distributed in conclusion (it’s the predicate of an E-form) but P is not distributed in major premise (it’s the predicate of an I-form) Moreover, S is distributed in conclusion (it’s the subject of an E-form) But S is not distributed in minor premise (it’s the predicate of an I-form) E OK by default, only minor premise is universal (both premises must be
This is the end of the preview. Sign up to access the rest of the document.