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ChiralSuperfields
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Dose someone please know why they have the absolute value bars in this derivation?
many thanks!
many thanks!
Thank you for your help @jedishrfu !jedishrfu said:The absolute value bars indicate the length of the vector not absolute value of a number.
Of course, the vector length is always positive.
I think this convention was more popular in early vector math books where as now they use the double v-bar notation.
https://en.wikipedia.org/wiki/Norm_(mathematics)