(Pardon if this seems a bit beginner, this is my first post in math - trying to improve my knowledge while tackling Project Euler problems)
I'm aware of Sigma notation, but is there a function/name for e.g.
4+3+2+1⟶10,
similar to 4!=4⋅3⋅2⋅1,
which uses multiplication?
Edit: I found what I was looking for, but is there a name for this type of summation?
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