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Old 05-05-2016, 09:05 AM
pouramini pouramini is offline
Join Date: Mar 2016
Posts: 16
Default invalid points in Z transform

The book says

" In general, some points in the Z space may not be valid transforms of any
x E X, and multiple points in X may be transformed to the same z E Z,
depending on the nonlinear transform <I>"
How a point in Z can be not a valid transform of any x?

I suppose any z is a map of a x, not!?
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