Syllogism

Types of Categorical Proposition

  

All S are P	Universal Affirmative
No S is P	Universal Negative
Some S are P	Particular Affirmative
Some S are not P	Particular Negative

Venn-diagram Representation of Four Propositions

         1.    Universal Affirmative : All S are P : here there are two possible diagrams one is whole S is inside P(i.e. S<P) and other is S and P  in  same circle (i.e. S=P)