考古学家袁靖认为：“先秦时期，马主要有三大用途：一是作为彰显地位的随葬品和祭祀品；二是作为挽车畜力，用于拉车、车战或驮物；三是用于骑乘，主要应用于战场。”春秋战国时期，孙阳（伯乐）擅长相马，马王堆汉墓出土有帛书《相马经》。从西汉景帝时期开始，逐渐出现“众庶街巷有马，阡陌之间成群”的景象，马的重要性日益凸显。东魏邺城时期，贾思勰编著的《齐民要术》中不仅保存了部分《相马经》，还发展出相马五脏法，对于马的饲养及医治记载得丰富详实。
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There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:，更多细节参见同城约会
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