循名责实,纯粹法理论(Pure Theory of Law)乃一法律理论(Theory of Law),其阐述自身之方式取决于研究对象。欲知纯粹法理论独到之处,必先究其对象之性质;首先,须回答“何谓法律”(what is law)之问题。法律理论,即世俗所谓之法学(jurisprudence)乃是一门古老的科学,但其却未能给出一个为研究者所普遍接受之法律定义。对此问题之解答有二:一说认为法律系一事实(fact),一种发生于时空中、并能为感官所感知的特定人之行为。事实本属自然科学之研究对象,譬如物理学、化学、生物学、心理学以及社 Named after reality, Pure Theory of Law is a Theory of Law, and the way in which it is formulated depends on the subject. To understand the uniqueness of the theory of pure law, the nature of its object must first be examined; first, the question of “what is law” must be answered. Legal theory, namely secular so-called jurisprudence, is an ancient science, but fails to give a legal definition that is generally accepted by researchers. There are two answers to this question: one is that law is the fact, a particular person’s behavior that occurs in space and time and can be perceived by the senses. The fact that the study of natural science, such as physics, chemistry, biology, psychology and social