Critical Thinking & Logic 4.4

13 flashcards

Conversion

Switch S & P

Obversion

Change the quality and add non to P

Contraposition

Switch S & P, add non to both

What are the 3 operations that can be performed on a categorical proposition?

Conversion, Obversion, and Contraposition

Class compliment

add non

In terms of converting, what form(s) is/are logically equivalent.

E & I

In terms of obversion, what form(s) is/are logically equivalent.

ALL

In terms of contraposition, what form(s) is/are logically equivalent.

A & O

Contraposit A

All non-P are non-S

Contraposit O

Some non-P are not non-S

Contraposit E

No non-P are non-S

Contraposit I

Some non-P are non-S