Eduction and Oppositional Inference

If Men are rational animals ....is true

then O is ...

• True

• False

• Doubtfful

If I is false.

A is ....

• True

• False

• Doubtful

If A is false

O is ....

• True

• False

• Doubtful

If E is true

I is .....

• True

• False

• Doubtful

If O is false...

Then A is ....

• True

• False

• Doubtful

Orig Prop: A unicorn is not a cat.

Obvert the Orig. Prop.

(a)  

Orig Prop: Some cars are not red.

Apply typ 2 contraposit.

(a)  

Every color is a kind of hue.

Give the type 2 inversion of the original prop

(a)  

No man is an island.

Apply simple conversion

(a)  

The closest brother of Jean is John.

Convert the Original proposition

(a)