Abstract
Devaney [5] defines a function to be chaotic if it satisfies three conditions: transitivity, having dense set of periodic points and sensitive dependence on initial conditions. Banks et al [2] prove that if the function is continuous then the third condition is implied from the first two and therefore it is redundant. However, if the function is not assumed to be continuous, then it is not known if the third condition is redundant or not. In this note, without assuming the function is continuous, we prove that the third condition is redundant if the underlying topological space is not precompact.
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