Eduction Flashcards
OBVERSION: A
A > E
All S are P>No S are non-P
Obversion: I
I > O
Some S are P>Not all S are non-P
OBversion: E
E > A
No S are P>All S are non-P
Obversion: O
O > I
Not all S are P>Some S are non-P
Which propositions are allowed in Obversion?
A,E,I and O
2 kinds of COnversion
Simple conversion and
Accidental Conversion
SIMPLE CONVERSION: E
E> E
No S are P> No P are S
Simple Conversion: I
I >I
Some S are P>Some P are S
ACCIDENTAL CONVERSION: A
A >I
All S are P> Some P are S
WHat’s allowed in Conversion
A, E, I
Types of CONTRAPOSITION
PARTIAL CONTRAPOSITION
FULL CONTRAPOSITION
PARTIAL CONTRAPOSITION: A
A
All S are P>No non-P are S
Partial Contraposition: E
E
No S are P>Some non-P are S
Partial COntraposition: O
E
No S are P>Some non-P are S
Full ContraPosition: A
A
All S are P>All non-P are non-S
Full COntraposition: E
E
No S are P>Not all non-P are non-S
Full Contraposition: o
O
Not all S are P>Not all non-P are non-S
What’s allowed in Contraposition
A, E, O
Types of Inversion
simple inversion
Complete inversion
SIMPLE INVERSION: A
A >O
All S are P Some non-S
are not P
Simple inversion : E
E> I
No S are P>Some non-S are P
COMPLETE INVERSION: A
A > I
All S are P Some non-S are non- P
Complete inversion: E
E > O
No S are P > Some non-S are not non-P
