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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:
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19:34, 27 февраля 2026Культура
转到机身背面，过往标志性的独立镜头排列不见了。S26 全系向自家的折叠屏老大哥 Z Fold7 看齐，老老实实加回了一个带有中岛的模组，这个设计见仁见智，个人觉得没有往代那么干净利落，但在这个各家厂商都在手机背面背着一个巨大奥利奥或者滚筒洗衣机的年代，S26 Ultra 反倒成了市面上为数不多的、正常单手握持时食指能够舒舒服服安放，而不会频繁摸到镜头的旗舰。