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Let $X,Y$ be compact metric spaces
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and $\pi\colon (X,T) \to (Y,T)$ a factor map.
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Then $(X,T)$ is an \vocab{isometric extension}
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of $(Y,T)$ if there is a real valued $\rho:$
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defined on the pullback, $\{(x_1,x_2) \in X^2 : \pi(x_1) = \pi(x_2)\}$, % TODO nice notation?
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of $(Y,T)$ if there is a real valued $\rho$
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defined on $\{(x_1,x_2) \in X^2 : \pi(x_1) = \pi(x_2)\}$
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such that
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\begin{enumerate}[(a)]
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\item $\rho$ is continuous.
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