1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Summation Question

  1. Aug 24, 2008 #1
    write out the following sum and compute where possible

    [tex]\sum 3[/tex] x =0 (x2 + 2x + 2)

    is that clear???
  2. jcsd
  3. Aug 24, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    do you mean

    [tex] \sum _{n = .3}(x^2+2x+2) = ?[/tex]

    when [tex]x=0[/tex]


    Now where is the index [itex]n[/itex] in the expression to be summed over?

    And where is your attempt to solution?
  4. Aug 24, 2008 #3


    User Avatar
    Science Advisor
    Homework Helper

    Malawi that doesn't make much sense either.
    Missusa, if you can't write proper LaTeX, it's better to do it completely without. For example, write
    "Sum from n = 1 to infinity of (e^(-n / 3) / n^2)"
  5. Aug 24, 2008 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Maybe OP means:

    [tex] \sum^3 _{x= 0}(x^2+2x+2) [/tex]
  6. Aug 24, 2008 #5


    User Avatar
    Science Advisor

    Is Integral right about what you mean? Then the sum, from x= 0 to 3 means you replace the "x" in x2+ 2x+ 2 by 0, then by 1, then by 2, then by 3, and add:
    (02+ 3(0)+ 2)+ (12+ 2(1)+ 2)+ (22+ 2(2)+ 2)+ (32+ 2(3)+ 2)
  7. Aug 24, 2008 #6


    User Avatar
    Staff Emeritus
    Science Advisor

    That's about the only way I see it making sense. Same as if the limits of summation were n = 0, 3 and x = n, an integer.
  8. Aug 24, 2008 #7
    Thank you so much you two are very smart...I do appreciate your help. That is what I meant but I could not write it the way it was.

    Thanks again,
  9. Aug 24, 2008 #8
    Can I get some information about Endogenous Moeny: honrizontalism and structuralism??
  10. Aug 24, 2008 #9


    User Avatar
    Science Advisor
    Homework Helper

    Definitely not. Especially if you are talking about Levi-Strauss anthropological structuralism with gratuitous misspellings.
  11. Aug 25, 2008 #10


    User Avatar
    Staff Emeritus
    Science Advisor

    That would be better suited in another thread, either in other sciences or in the economic forums.

    Ostensibly, such a disussion is found in one's macroeconomic textbook, or one can search on Google with the keywords. Nevertheless -

    http://www.trincoll.edu/~setterfi/Horizontalism,%20Structuralism%20and%20Historical%20Time.pdf [Broken]

    Complexity, Endogenous Money and Macroeconomic Theory By Mark Setterfield

    http://cas.umkc.edu/econ/economics/faculty/Fontana/Winter 2005/ROPE.pdf
    Last edited by a moderator: May 3, 2017
  12. Aug 25, 2008 #11
    Thank You!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Summation Question Date
Summation with binomial coefficients question Apr 29, 2015
Summation question May 29, 2014
Summation question within complex numbers Jan 4, 2013
Mathematical induction w/ Summation question May 25, 2011
Summation Question Sep 14, 2010