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## Main Question or Discussion Point

as a student in physics, i cannot see the usefulness of green function

to me, the definition of a green function is ugly and singular

we have to deal with functions that are not smooth, e.g., the derivative is not continuous at some point.

How these functions can be useful in math and physics?

to me, the definition of a green function is ugly and singular

we have to deal with functions that are not smooth, e.g., the derivative is not continuous at some point.

How these functions can be useful in math and physics?