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Line 4: :<math>\mathop{\rm supp}\hat{f} \subseteq \mathbb{R}_+.</math> It is called '''super regressive''' if and only if the time reversed function ''f''(−''t'') is progressive, or equivalently, if :<math>\mathop{\rm supp}\hat{f} \subseteq \mathbb{R}_-.</math>

Progressive function: Difference between revisions