Jaap Hage

This book is exceptional in the sense that it provides an introduction to law in general rather than the law of one specific jurisdiction, and it presents a unique way of looking at legal education. It is crucial for lawyers to be aware of the different ways in which societal problems can be solved and to be able to discuss the advantages and disadvantages of different legal solutions. In this respect, being a lawyer involves being able to reason like a lawyer, even more than having detailed knowledge of particular sets of rules. Introduction to Law reflects this view by focusing on the functions of rules and on ways of arguing the relative qualities of alternative legal solutions. Where 'positive' law is discussed, the emphasis is on the legal questions that must be addressed by a field of law, and on the different solutions which have been adopted by, for instance, the common law and civil law tradition. The law of specific jurisdictions is discussed to illustrate possible answers to questions such as when the existence of a valid contract is assumed.

This paper develops the theory that a set ofrules is consistent if it is not possible that (1)the conditions of the rules in the set are allsatisfied, (2) there is no exception to either one ofthe rules, and (3) the consequences of the rules areincompatible. To this purpose the notion ofconsistency is generalised to make it cover rulesand is relativised to some background of constraints.This theory is formalised by means of Rule Logic, inwhich rules are treated as constraints on thepossible worlds in which they exist. Rule Logicitself is introduced by giving a model-theory forit. It is characterised by means of constraints onworlds that are possible according to Rule Logic.

My main claim in this article is that lawyers should make less use of the hermeneutical method than they do. The reasons that I will adduce to support this claim are the following: law is first and foremost an answer to the question of how to act and, more in particular, the question of which rules to enforce by collective means. As such, law does not coincide with positive law. Nevertheless, positive law determines the content of the law to a large extent. It does so for two reasons. The first reason is that positive law contributes to legal certainty and that legal certainty is very important for the question concerning which rules should be enforced by collective means. The second reason is that respect for positive law, which was created by democratic bodies, implies respect for democracy. However, positive law can only contribute to legal certainty if its application is predictable. If positive law can be interpreted in more than one way, its application will not be predictable. In that case, positive law is not relevant for the content of the law tout court. Theories about the interpretation of positive law are particularly relevant where positive law can be interpreted in different ways, that is where positive law is not relevant for the content of the law tout court. Therefore, hermeneutical theories are not relevant for the content of the law and lawyers should not waste their time on them. A similar argument can be given for the democratic legitimation of positive law.

Classical logic is based on an underlying view of the world, according to which there are elementary facts and compound facts, which are logical combinations of these elementary facts. Sentences are true if they correspond to, in last instance, the elementary facts in the world. This world view has no place for rules, which exist as individuals in the world, and which create relations between the most elementary facts. As a result, classical logic is not suitable to deal with rules, and is therefore unsuitable to deal with legal reasoning. A logic that is more suitable should take into account that law is a part of social reality, in particular a part that consists of constructivist facts, and that rules play a central role in law. This article gives a superficial description of how social reality exists and of the place of law and legal rules in it. It uses this description to argue that traditional techniques to reason with and about legal rules provide a better logic for law than classical logic. These techniques can be accommodated in a logic that treats rules as logical individuals.