invariant

nouns

a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it
domain category
a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
is a type of (narrower)
a prominent attribute or aspect of something
"the map showed roads and other features"; "generosity is one of his best characteristics"

adjectives

unaffected by a designated operation or transformation
is derived from
is similar to
not liable to or capable of change
"an invariable temperature"; "an invariable rule"; "his invariable courtesy"
domain category
a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
unvarying in nature
"maintained a constant temperature"; "principles of unvarying validity"
is derived from