How can I create the inert form of the following function: dm:=z->diff(z,t)+v[c]*d_[c](z); Note d_ is the new indicial differential operator available in physics package of Maple 11. Its inert form is %d_. What I need is that when I write, dm(rho), maple does not expand it into two terms using the above function, but displays the compact form dm(rho). I want to see the expanded form, only when needed, not at every step where dm is used. So at other steps, I just want to see dm(rho), without evaluation. Thanks, Pawan Takhar

I need to calculate derivative of a scalar function psi, which depends upon the scalar theta and tensor G[i] using the diff command and indicial notation capability of the recently included Physics package. My actual equation is longer, but here I am only including the terms needed to present my question. Please see below:

restart;

with(PDEtools):

> with(Physics):

Setup(dim=[3,`+`],spacetimeindices=lowercaselatin);

I am using the new Physics package for Maple 11 to do indicial calculations for a continuum mechanics problem. I need two sets of coordinates for Lagrangian and Eulerian frames. In Maple, I have defined two sets coordinate (X and Y) each with dimension equal to three. Summation is not performed over the time variable, which is treated differently. If, X is a point in Eulerian frame, it is related to the Lagrangian frame (Y) by: X=X(Y,t) How could I calculate "X[k],K" ? Where the smaller index is in Eulerian coordinates (X), the capital index is in Lagrangian coordinates (Y) and "comma K" (,K) denotes the derivative of X[k] with respect to Y[K]. Could someone show me its implementation using the d_ command.