both derivatives and intersection/complement operators originally came from a 1964 paper by Janusz Brzozowski (below).
“把发展冰雪经济作为新增长点，推动冰雪运动、冰雪文化、冰雪装备、冰雪旅游全产业链发展。”，详情可参考体育直播
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first row all zeros after the very first element:，更多细节参见哔哩哔哩