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I Question on §3 of Einstein's 1905 paper

  1. Jan 15, 2017 #1
    Hi guys,

    This is my first time posting on PF!

    I have a question on §3 of Einstein's paper "On the electrodynamics of moving bodies."

    My problem is with the following mathematical statements:


    Hence, if x' is chosen to be infinitesimally small,




    I have just finished highschool, and whilst I have finished two other books which concerned Special Relativity (and understood them well) I think I do not know enough maths to understand what i pasted above. Could someone explain how he gets from step 1 to step 2 please?
    Or, perhaps could someone tell me what topics in calculus I must learn in order to understand it myself?


    EDIT: I found many other threads asking the exact same thing as me... Oops! I managed to derive it on my own so no answer is necessary :).
    Last edited: Jan 15, 2017
  2. jcsd
  3. Jan 15, 2017 #2


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    Staff: Mentor

    Mind posting the derivation so others can see how it was done?
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