Revision history [back]

sorry here : f(x,y)=x^3+x*y

h(x,y,z)=f(x,y)-z

i understand your explanations

my aim is to put the region of definition at the beginning of the programm that's why i tried to define it by a function but i understand that :

 (y<=-1.1 or y>=-0.96)

dont act the same way if it is in a pure sage function like implicit3d or in a function that will be interpreted as a python function.

My problematic is not very important, it is comfort, but i really wonder how to solve it…