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Re: [Phys-L] emended puzzle about vectors (and the structure of the world)



Alas on 5/4/22 11:32 AM, I wrote:
    A·B = (1/4)  [ (A+B)² + (A−B)² ]

That's supposed to be
A·B = (1/4) [ (A+B)² − (A−B)² ]

with a minus sign in the middle.

Sorry for the confusion.

h/t Jeffrey Marx