if the extra coordinate [tex]y \in [-\pi,\pi] [/tex] with [tex] A(y)=A(y+2 \pi) [/tex] and [tex]A'[/tex] is non continuom in [tex] -\pi,0,\pi [/tex](adsbygoogle = window.adsbygoogle || []).push({});

why

[tex] \oint (A'e^A)' dy =0 [/tex] but [tex] \oint e^A dy \neq 0 [/tex]????

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# Integral brane world

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