Hi i found this "error" in my text book in series.(adsbygoogle = window.adsbygoogle || []).push({});

https://www.physicsforums.com/attachment.php?attachmentid=9420&stc=1&d=1173538014

This is a geometric one, it converges for |z|< 1/rot(2) when i calculate this, but the text book claims that |z|<1/2

I also checked different values on z and i get a finite value even when z is 0,7

[ 0,5< 0,7 < 1/rot(2) ]

Who is right?

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# Error in book ?

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