=(x y) evaluates to yes when the two are equal.
=(x y)
.= tests two nouns for equality, giving a loobean.
.=
.=(3 3) is %.y, and .=(3 4) is %.n.
.=(3 3)
%.y
.=(3 4)
%.n
irregular forms:
=(a b) is .=(a b)
=(a b)
.=(a b)