Hello,

In comsol, d/dt can be written as ut and d/dx can be written as ux, If it is double integral they same will be as utt and uxx.

Hope this help you,

Thanks and Regards,

sabarinathan

Looks like the Product Rule, not the Chain Rule (or is F=F(p)?). If product rule, d(Fp)/dx=pdF/dx+Fdp/dx, so in comsol: p*d(F,x)+F*d(p,x). Modify if you truly mean chain rule.@ Afaz Ul Hoq

I personally agree with Sabarinathan Pushparaj Subramaniyan