We generalize Gel'fond's criterion of algebraic independence by taking into
account the values of the derivatives of the polynomials, and show how the
new criterion applies to proving results of algebraic independence using i
nterpolation determinants. We also establish a new result of approximation
of a transcendental number by algebraic numbers of bounded degree and size.
It contains an earlier result of E. Wirsing and also a result announced by
A. Durand.