The axiom says:(adsbygoogle = window.adsbygoogle || []).push({});

"The interaction between two observations is constrained by causality

[tex]|x-y|^2 <0 \Rightarrow [\phi(x),\phi(y)]=0[/tex]

"

But |x-y|^2<0 is always false that means the if the condition applies then by simple logic the consequnet of the condition can occur or not occur, I don't understand this.

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# Ax 4 in page 19 of Ticciati's QFT textbook.

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