[Getdp] Basic questions from a beginner

[Egmont Schreiter]

Hello,
 i am just beginning to learn and work with getdp (with gmsh). After 
trying some of the examples from the wiki, now i try to understand the 
formulation. Later I have to solve a problem in 3D with coupled 
inductors and ferrite.

Now I stop at the electrostatic example mStrip.geo & mStrip.pro. There 
is the formulation:
Equation {Galerkin { [ epsr[] * Dof{d v} , {d v} ]; In DomainCC_Ele; 
Jacobian Vol; Integration GradGrad; }}

My questions:
1. Can Dof{d v} also be written as Dof{Grad v}? - Where is this 
documented? (I searched the mail-list for it)
2. Means Dof{x} that x is the unknown?
3. In this case (2.), why is {d v} repeated after  "Dof{d v},"?

So far for my first posting. I would be glad about your answers.
Best regards
Egmont Schreiter
-- 

Dipl. Ing. (FH) Egmont Schreiter
Email: ESchreiter at hs-zigr dot de