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B Meaning of "d"?

  1. Jul 27, 2016 #1
    [Mentor's note: This question was split off from: https://www.physicsforums.com/threads/meaning-of-physical-quantities-and-division.880214/] [Broken]

    What does this differential "d" mean? Why say dE instead of E?
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    or
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    Last edited by a moderator: May 8, 2017
  2. jcsd
  3. Jul 27, 2016 #2

    Nugatory

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    Staff: Mentor

    If you look carefully you'll see that there's a ##d\omega_i## in there as well. This formula is telling you how much ##E## will change (##dE##) if you change ##\omega_i## by a little bit (##d\omega_i##). The actual values of ##E## and ##\omega_i## could be pretty much anything as far as this formula is concerned, but whatever they are, if one them is changed by a small amount the other will change by the small amount calculated from the formula.
     
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