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Temporal validity of norms is tied to due process and legal certainty principles. Like wise, a norms possibility to be applied at different moments in time is based in cer tainty and fairness principles. It is with this back ground and frame work that the subject of retroactivity is addressed, understanding its nature, aims and reach, arguing that this form of application of norms does not undermine the unity and coherence of a legal system.

Sobre la validez temporal de las normas. La retroactividad y la ultraactividad de las normas en el sistema jurídico