See this is why I'm going to Boulder, CO.
'Cause I keep coming across stuff coming out of there ...
that does things right and makes sense!
Source
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| (sorry I stole'd your copyrighted stuff man) |
Definition of functional derivative
This is exactly the explanation I was looking for. <3. Thank you for telling me what I need to know...
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| L(h) is the differential |
then showing me exactly how I wanted to use it!
What he derives is the same problem as the QFT for noobs exercise problem. (Euler-lagrange looking thing ex1.3 p17). It matches the result I got for the functional derivative, not what the QFT book says!
See? There is a derivative term multiplied by the (delta) function h, that the physics people ignored!! I wasn't completely wrong!
Maybe it goes to zero if we extend the limits of integration to infinity? Or maybe it is very small compared to the other terms? Who knows... *smh*... physics people... They need to go learn some math or something.
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