Este ensayo contiene un análisis de las posiciones de Hans Kelsen, Ulrich Klug y Eugenio Bulygin sobre la relación entre ontología y lógica de las normas. El análisis parte del intercambio epistolar entre Kelsen y Klug sobre la aplicabilidad de la lógica a las normas jurídicas. Bulygin ha sugerido que la discrepancia entre Kelsen y Klug se basaba en dos concepciones radicalmente distintas de las normas sostenidas por dichos autores. Tal sugerencia es puesta en entredicho en este ensayo.

Abstract: This essay contains an analysis of the views of Hans Kelsen, Ulrich Klug and Eugenio Bulygin, about the relationship between the ontology and logic of norms. The analysis has its origins in the epistolary exchange between Kelsen
and Klug about the applicability of logic to legal norms. Bulygin has suggested that the discrepancy between Kelsen and Klug was based in two radically different conceptions of norms maintained by these authors. Such a suggestion is discussed in this essay.