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