The purpose of this text is to offer a logical analysis of legal propositions, especially of constitutional propositions. This analysis shows the relationship between truth-conditions of legal propositions and the problem of indeterminacy. Where the law is indeterminate, legal propositions lack truth-values. The background of this approach is the philosophical debate between realism and antirealism.;The book deals with the notions of legal norms and legal systems and provides an analysis of the notion of legal indeterminacy and its relation to gaps, contradictions and the vagueness of legal concepts. It shows also that the simple model of a legal system is not sufficient to account for the complexity of legal propositions referring to legal systems of some degree of maturity. Several notions from legal dynamics are presented in order to bring to light the importance of concepts like applicability or hierarchy for the determination of the truth-value of a legal proposition. Thus the primacy of constitution becomes a central idea in the theoretical reconstruction of most contemporary legal systems; a conceptual explanation of this idea is presented and some conclusions from that explanation are drawn. Finally, a particular conception of constitutional interpretation is proposed.
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