necessary condition
sufficient condition
implication
conditional relation
logical implication
affirming the consequent
contraposition
importation
quadratic reciprocity
exportation
mathematical induction
antecedent
consequent
prime ring
contrastivism
Ford circle
law of excluded middle
predicate
existential instantiation
categorical proposition
prime ideal
Wall-Sun-Sun prime
conchoid
p-adic norm
Liouville number
contradiction in terms
contradiction
explanandum
term logic
Iverson bracket
explicandum
circle of Apollonius
is-ought problem
limit point
formalism
law
characteristic polynomial
material implication
stationary distribution
sentential logic
zero-order logic
proposition
dialectic
P-bar
p-adic absolute value
Abel polynomial
paradox
clausification
mean value theorem
reductio ad absurdum