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A principle is a law or rule that has to be, or usually is to be followed, or can be desirably followed, or is an inevitable consequence of something, such as the laws observed in nature or the way that a system is constructed. The principles of such a system are understood by its users as the essential characteristics of the system, or reflecting system's designed purpose, and the effective operation or use of which would be impossible if any one of the principles was to be ignored.〔Alpa, Guido (1994) "General Principles of Law," Annual Survey of International & Comparative Law: Vol. 1: Is. 1, Article 2.(),〕 Examples of principles are descriptive comprehensive and fundamental law, doctrine, or assumption, the normative rule or code of conduct, and the law or fact of nature underlying the working of an artificial device. As cause The principle of any effect is the cause that produces it. Depending on the way the cause is understood, the basic law governing that cause may acquire some distinction in its expression. ===Causality, as efficient cause=== The efficient cause is the one that produces the necessary effect, as long as the necessary and sufficient conditions are provided.The scientific process generally consists of establishing a cause by analyzing its effect upon objects. In this way, a description can be established to explain what principle brought about the change-effect. For this reason the principle of cause is considered to be a determining factor in the production of facts. The principle of causality states that "every event has a cause"; for instance, everything that begins to exist must have a cause. It was formulated by Aristotle's theory which states that: "Everything that moves is moved by another". This principle, in conjunction with the principle that an infinite regress is not possible, has been used to argue for God's existence. The principle of causality is often associated with the similar, though distinct, principle of sufficient reason, according to which, there is a reason why everything is the particular way it is rather than some other way. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Principle」の詳細全文を読む スポンサード リンク
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