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Where do the forms of the generators come from? According to me they aren't the conventional forms. It should rather be:

${\displaystyle M_{\mu \nu }\equiv i(x_{\mu }\partial _{\nu }-x_{\nu }\partial _{\mu }),}$

${\displaystyle P_{\mu }\equiv -i\partial _{\mu },}$

${\displaystyle D\equiv -ix_{\mu }\partial ^{\mu },}$

${\displaystyle K_{\mu }\equiv i(x^{2}\partial _{\mu }-2x_{\mu }x_{\nu }\partial ^{\nu }),}$

For example if we take a function ${\displaystyle f(x_{\mu })}$ and we dilate it, we get

${\displaystyle f((1+\epsilon )x_{\mu })\approx f(x_{\mu })+\epsilon x_{\mu }\partial ^{\mu }f(x_{\mu })}$

which should be the same as

${\displaystyle e^{i\epsilon D}f(x_{\mu })\approx f(x_{\mu })+i\epsilon Df(x_{\mu })}$

Greets, David 08:39, 8 June 2007 (UTC) reply

I've cleaned it all up myself. MuDavid ( talk) 12:22, 13 October 2009 (UTC) reply

The definition of P is wrong, should be

${\displaystyle P_{\mu }=i\partial _{\mu }}$

See L.H. Ryder, "Quantum Field Theory", 2nd ed. Antimatter33 ( talk) 03:35, 25 December 2010 (UTC) reply

Because it is mentioned every now and then in physics; "I can't read this it's in Greek!" This article needs a tag for improvement or to notify the user opening the page it is not meant to be understood by the layman. There might as well not be any text on this page and just equations; one blue link after another after another after another... Wikipedia is here to define and document things NOT to be a search engine! Lazy!

 — Preceding 
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