What is "identical equation"

Identical \I*den"tic*al\, a. [Cf. F. identique. See Identity.]

1. The same; the selfsame; the very same; not different; as, the identical person or thing.

   I can not remember a thing that happened a year ago, without a conviction . . . that I, the same identical person who now remember that event, did then exist.
   --Reid.

2. Uttering sameness or the same truth; expressing in the predicate what is given, or obviously implied, in the subject; tautological.

   When you say body is solid, I say that you make an identical proposition, because it is impossible to have the idea of body without that of solidity.
   --Fleming.

   Identical equation (Alg.), an equation which is true for all values of the algebraic symbols which enter into it.