Recent content by Peter VDD

What does it mean "an analytic function", "analyticity" of a function? I know we have seen it but i cannot find it back.

Yes, I suspected something like that yet :) but the term is described nowhere in our course. {or I still have to find it} Thx.

What is the arg() function? I can find no reference to it? exp(z)=w => z=ln(|w|)+i*arg(w)+2*k*Pi*i what's that arg()?

I agree with the initial poster, math in lower years (here especially before university) is incredibly boring and enerving. Still, it will get better when you climb up in university years :)

gradient f of a surface = [ diff(f,x), diff(f,y), ... ]; so that means, the partial derivates to each variable. So the direction it changes fastest in. Thus perpendicular to the "touching plane" (dunno the correct word), so indeed it is perpendicular to the surface as well, but beware, it is...