bit - ANSWER: symbol with two possible values, namely 0 and 1
boolean variable - ANSWER: a variable with a value of either true or false
bit string - ANSWER: sequence of zero or more bits; the length of this string is the number of bits in
the string
tautology - ANSWER: a compound proposition that is always true, no matter what the truth values of
the propositional variables that occur in it (emphasis on always)
contradiction - ANSWER: a compound proposition that is always false
contingency - ANSWER: a compound proposition that is always true
logically equivalent - ANSWER: compound propositions that have the same truth values in all possible
cases; when these two propositions, p and q, in the compound proposition p iff q is a tautology.
(emphasis on truth values)
distributive law (disjunction over conjunction) - ANSWER: p V (q^r) = (p v q) ^ (p v r)
De Morgan's Laws - ANSWER: how to negate conjunctions and disjunctions; the negation of a
disjunction is the conjunction of the negation of the components; the negation of a conjunction is the
disjunction of the negations of the component propositoins
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