tautology
posit
postulate
contradiction
contradiction in terms
proposition
paradox
axiom
logicist
negation
explanandum
explicandum
completeness
imply
argumentum ad consequentiam
propositional calculus
ex falso quod libet
logicality
rhyme or reason
corollary
reason
principle of explosion
a priori
law
suprarational
suppositum
consistency
zero-order logic
sentential logic
term
truth
true statement
elicit
disjunction
premiss
metalogic
assumption
premise
abstract universal
material implication
condition
pseudorational
ratiocination
trivialist
logically
conditional proof
perfect pitch
ratiocinator
truth value
apodeictic