argument
collection of truth-bears (things that are true or false) some of which are offered as reasons for one of them, the conclusion
premises
reasons offered within an argument
conclusion
proposition that premises are offered for
validity
deductive argument said to be valid if and only if it takes a form that makes it impossible for the premises to be true and the conclusion to be false
soundness
deductive argument said to be sound if and only if it is both valid, and all of its premises are actually true
inference
logical conclusion that is drawn from premises that are or are assumed to be true
implication
entailment
premises logically entails a conclusion if when A is true B must also be true
contradiction
conjunction in the form “A and not A”
conceptual scheme
frame of thought