det2x2_by_formula
det3x3_by_formula
det4x4_by_formula
det5x5_by_formula
det6x6_by_formula
to:
determinant
How cute... a name independent of the dimension, and even readable !
It makes more code parameterized by the dimension as template argument.
It provides iterators and a few basic functions already such as operator==...
I added CGALi::make_array() to easily and efficiently construct them.