• reflex
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    42 years ago

    Did my undergrad in math and never learned what that capital pi-looking thing was. Sigmas all the tyme doe.

      • mohKohn
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        12 years ago

        They come up in complex analysis bc writing polynomials in terms of their roots is sometimes useful.

    • Kogasa
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      12 years ago

      Convergence issues aside, you can get from a product to a sum by taking logarithms. This is often a feasible way to reason about them / prove results about them.