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This is not a problem statement this is not homework this is not a textbook exercise. This is my own question about a formula in a textbook.
I am trying to understand the way that equation 4.2.2 is rewritten as equation 4.2.3
Source: Stanley Middleman
My confusion is with the 1/2 and the subscripts used.
Homework Statement
I am trying to understand the way that equation 4.2.2 is rewritten as equation 4.2.3
Homework Equations
Source: Stanley Middleman
The Attempt at a Solution
My confusion is with the 1/2 and the subscripts used.