Tangent numbers

First order jet spaces, namely , are implemented in the class tangent defined in tangent.hpp. They are compatible with all the floating types.

#include<numerix/tangent.hpp>
using namespace mmx;
void main () {
  tangent<double> a (2.0, 3.0);
  mmout << "a= " << base (a) 
        << " + " << slope (a) << " * x + O(x^2)\n";
}

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