《易经》是中国最古老的文献之一，并被儒家尊为"五经"之首，上古三大奇书之一。《易》事实上是包括了古代的《连山》、《归藏》和《周易》，但《连山》和《归藏》已经失传。《易经》以一套符号系统来描述状态的变易，表现了中国古典文化的哲学和宇宙观。它的中心思想，是以阴阳交替的变化描述世间万物的变化。
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