Question: Can Maple work with differential operator without introducing a known function?

In the name of God

Dear my friends

Hi

Can Maple work with differential operators without introducing a known function?

For example, assume that we have

diff(diff(f(x),x)+f(x),x);

How can we apply differential operators such as diff or D without applying any known function as:

diff(diff(...,x)+...,x);

if we can, we can then calculate each expression containing differential operators such as

diff((diff(...,q)+diff(f(x),x,x)*diff(...,x)),q$n);

In this manner, we can later intoduce a new function instead of (...) for next calculations. doing it is very useful for me.

best regards

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