1.NounA function defined by a (multivariable) implicit equation when one of the variables is regarded as the value of the function, especially where said equation is such that the value is not directly calculable from the other variables.
"An important class of implicit functions comprises those defined by equations of the form
x
−
f
(
y
)
=
0
{\displaystyle x-f(y)=0}
. Choosing
y
{\displaystyle y}
as the value means that the implicit function is the inverse of
f
{\displaystyle f}
. This type of implicit function is of particular interest when that inverse is not expressible as a closed-form expression, and thus is difficult to study directly."