Would you allow me to ask this one question?
Is it possible to apply diffop2de() to three different functions in a single expression? For example, the attached worksheet shows an expression, 'eq_e5_9', where three time domain function derivatives are defined, D*Delta__delta(t), D*Delta__psi__d(t) and D*Delta__psi__q(t). However, once 'diffop2de(eq_e5_9, f(t))' is applied, none of them gets propely unrolled (e.g, D*Delta__delta(t)becomes d/dt*Delta__delta(t))
Besides, this is my third time attempting to post a question. The first one got disappeared with no sign, the second one came out with a site error message.
In Kwon Park