categorical syllogisms

A category is distributed in a categorical statement if:

A statement says something about everything in the category

M categorical syllogisms

The middle term must be distributed in at least one premise

T categorical syllogisms

If a Term Is Distributed in the Conclusion, It Must Be Distributed in the Premises

A categorical syllogisms

At least one premise must be affirmative

N categorical syllogisms

If the syllogism has a negative conclusion it must also have at least one negative premise

U categorical syllogisms

If a syllogism has at least 2 universal premises, it cannot have a particular conclusion

Conversion

Switch P and S

Contraposition

Switch P and S, put non- in front of both

Obversion

Switch Affirmative and Negative, put non- in front of predicate

Contradiction

If A true then O false, if E true then I false