This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.
抖音和小红书相继加码长图文，本质是围绕优质创作者和用户停留时间的争夺。只不过前者选择横向进行扩张，在短视频信息流中插入风格截然不同的长图文内容；而后者则是在原有的图文形式上纵向深挖，通过AI工具降低内容的创作门槛。从更深层看，这也是内容平台进入存量竞争后的必然选择。
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Those are, perhaps, topics for future posts.
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