this post was submitted on 16 Jul 2023
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I don't know anything about the original post author, but product notation is the same as summation notation except that instead of adding each new term to the running total, you're multiplying each new term. You don't have to know programming to see from the code samples that the only difference in the code is
+=vs*=(well, maybe it would help to know that * means multiply; I honestly dont rember how common-knowledge that is).