It's not really that relevant that I first encountered this mathematical argument on a white board in a 5 sided building in Arlington, Va.
A = B
A2 = AB
A2 - B2 = AB - B2
(A - B) (A + B) = B(A - B)
A + B = B
B + B = B
2B = B
2 = 1
Don't just knee jerk and run the data thru the algorithm. Remember that when complex systems fail, they fail in complex ways, so much so that their very failure may be hard to detect.
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