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Hello,
I have encountered an equation in page 33 in the book of D.MacMahon titled QFT demystefied.
It is the third equation from the top...how did the sum appear as a middle step of the equation?
best regards.
Abolaban
I have encountered an equation in page 33 in the book of D.MacMahon titled QFT demystefied.
It is the third equation from the top...how did the sum appear as a middle step of the equation?
best regards.
Abolaban