I have to integrate some function on a volume whose boundaries correspond to an intersection of three cylinders. In some cases of symmetry, I succeed in determining the boundaries (where the function is not equal to zero) . But in some other cases it's too complicated to take in account the third cylinder.
How can I do the integration, even if I don't know exactly the boundaries? Is it possible to integrate a function that can be either zero or another value? (I thought that I could take in account the third cylinder using step functions...).
Thank you for all suggestions!
See attachment for an example...
Attachment: exempled'integr.nb, URL: ,