coinitial

As a noun superset

is (set theory) (symbol: '''') with respect to another set, a set such that each of the elements of the other set is also an element of the set.

As an adjective coinitial is

(mathematics|of a subset) having an element b'' for each element ''a'' in the superset such that ''b'' is less than or equal to ''a .

As a noun element

is element (part of a whole).

As an adjective coinitial is

(mathematics|of a subset) having an element b'' for each element ''a'' in the superset such that ''b'' is less than or equal to ''a .

As a noun subset

is (set theory) with respect to another set, a set such that each of its elements is also an element of the other set.

As an adjective coinitial is

(mathematics|of a subset) having an element b'' for each element ''a'' in the superset such that ''b'' is less than or equal to ''a .