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Do not understand symbol in homework

  1. Dec 4, 2011 #1
    My teacher, on the homework, posted what looked like a Reimman sum, except instead of a capital sigma, there was a Pi symbol instead. I never learned what that means or what its called. Can someone explain it to me?
     
  2. jcsd
  3. Dec 4, 2011 #2
    Thats a product. Instead of adding like in the riemann sum, you multiply everything.

    [itex]\prod n= 1 \cdot 2\cdot \cdot \cdot \cdot[/itex] basically. If, n was from 1 to infinity.
     
  4. Dec 4, 2011 #3

    D H

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    Staff Emeritus
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    It means product. Wallace's formula for pi, for example:

    [tex]\frac {\pi} 2 = \Pi_{n=1}^{\infty} \frac {(2n)^2}{(2n-1)(2n+1)}[/tex]
     
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