Go A categorical syllogism is an argument consisting of exactly three categorical propositions (two premises and a conclusion) in which there appear a total of exactly three categorical terms, each of which is used exactly twice.
Go The fallacy is committed when a standard form categorical syllogism contains four terms.
Go The middle term in the premises of a standard form categorical syllogism never refers to all of the members of the category it describes.
Go A particular conclusion is drawn from universal premises.
Go A standard form categorical syllogism has two negative premises (a negative premise is any premise of the form 'No S are P' or 'Some S is not P').
Go The conclusion of a standard form categorical syllogism is affirmative, but at least one of the premises is negative.
Go Any argument of the following form is invalid: (1) If A then B (2) B Therefore, A
Go The predicate term of the conclusion refers to all members of that category, but the same term in the premises refers only to some members of that category.