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Sumatory in LaTeX

  1. Dec 5, 2011 #1
    Hy everyone!

    I want to include this two lines:
    m,n
    m+n=k

    but only in the bottom of the sumatory. Is that possible?

    Thanks in advance for the help!
     
  2. jcsd
  3. Dec 5, 2011 #2

    D H

    User Avatar
    Staff Emeritus
    Science Advisor

    \sum_{\substack{m,n\\m+n=k}}

    [tex]\sum_{\substack{m,n\\m+n=k}}[/tex]
     
  4. Dec 5, 2011 #3
    Awesome! Thank U very much!!!!!

    Can I ask U something else? Do you know if I can include text in cursive? The sentence is

    [tex] \textbf{L} (U) = f(x) [/tex]

    where L (that should be in cursive) is a differential operator like
    [tex]\frac{\partial}{\partial x}[/tex]

    Thanks in advance again!!!

    PFmet
     
  5. Dec 5, 2011 #4

    D H

    User Avatar
    Staff Emeritus
    Science Advisor

    \mathcal L(U) = f(x)

    [tex]\mathcal L(U) = f(x)[/tex]
     
  6. Dec 5, 2011 #5
    Wow DH! Thank U very very much! My work is perfect now.

    GRACIAS! DANKE! OBRIGADA! = THANKS!

    PFmet
     
  7. Dec 5, 2011 #6

    Mark44

    Staff: Mentor

    We call this symbol - [itex]\sum[/itex] -- a summation, in English.
     
  8. Dec 5, 2011 #7
    Thanks Mark! My language is Spanish! :)
     
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