Numerical integration methods

[parisse]

int uses an adaptive method, as described here in French (Hairer: https://www.unige.ch/~hairer/poly/chap1.pdf).
Source code is available from giac source code
https://github.com/geogebra/giac/blob/ma...pp/intg.cc, function

Code:

  bool tegral(const gen & f,const gen & x,const gen & a_,const gen &b_,const gen & eps,int nmax,gen & value,bool exactcheck,GIAC_CONTEXT){...}