정청래 “조희대, 사법개혁 저항군 우두머리냐? 사퇴도 타이밍 있다”
“让更多孩子不仅‘有学上’，还能‘上好学’”
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Abstraction is indeed the key of any modularization, and without modularization every hope of being able to guarantee reliability and correctness vanishes.
it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
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