Binary relation
any set of ordered pairs; (on a set A) collection of ordered pairs of elements of A, i.e. subset of A × A; (between two sets A and B) collection of ordered pairs with first element in A and second element in B
multiple
function
converse relation
upper and lower bounds
subsequence
empirical relationship
epigraph
reachability
simultaneity
single-valued function
partial function
subset
sufficient condition
surjective relation
perpendicularity
semantic relation
accessibility relation
inequality
incidence structure
mapping
matrix congruence
subclass
dependence relation
parallelism
euclidean relation
left-unique relation
heterogeneous relation
serial relation
proper subset
inclusion
correspondence
coincidence
necessary condition
miscibility