[Help-gsl] how does cheb_eval_e work?

[KL Tah]

Hi All,

Does anyone happen to know what the math is behind cheb_eval_c and how 
it calculates error bounds? Does it have anything to do with the 
minimax theorem? If so, how does the statement of this theorem relate 
specifically to the code given in cheb_eval.c?

Cheers,
KL