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The `GradientNonLinear` procedure

The purpose of this procedure is to compute the jacobian of the non
linear part of the equations in order to improve their interval
evaluation. The syntax of this procedure is:
void GradientNonLinear(INTERVAL_VECTOR &x,INTERVAL_MATRIX &J)

where `x` is an interval vector which contains the range for the
unknowns and `J` is the corresponding jacobian interval matrix.

Jean-Pierre Merlet
2012-12-20