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Old 02-17-2016, 04:05 AM
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yaser yaser is offline
Join Date: Aug 2009
Location: Pasadena, California, USA
Posts: 1,478
Default Re: Exercise 1.3 (b)

By convention, the vector \bf x includes the zeroth coordinate x_0 which is fixed at +1, hence the norm of \bf x cannot be zero.
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