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Math Help - commutators

  1. #1
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    commutators

    [x, i d/dx] what is the value of this commutator
    can anyone check my work please:

    [x, i d/dx] = ixf '(x) - if (x) - ixf '(x)

    [x, i d/dx] f(x) = -if(x)

    [x, i d/dx] = -i
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  2. #2
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    Quote Originally Posted by myoplex11 View Post
    [x, i d/dx] what is the value of this commutator
    can anyone check my work please:

    [x, i d/dx] f(x) = ixf '(x) - if (x) - ixf '(x) Mr F says: The red f(x) needs to be included.

    [x, i d/dx] f(x) = -if(x)

    [x, i d/dx] = -i
    Looks fine.
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