In mathematics, specifically in algebraic topology, the cup product is a method of adjoining two cocycles of degree p and q to form a composite cocycle of degree p + q. This defines an associative (and distributive) graded commutative product operation in cohomology, turning the cohomology of a space X into a graded ring, H?(X), called the cohomology ring.
例句与用法
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Paper cup product machinery manufacture co . , ltd 亚崎纸杯机械制造有限公司
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Paper cup product machinery manufacture co . , ltd at ecthai . com - an e - commerce gateway in thailand 亚崎纸杯机械制造有限公司泰国电子商务途径ecthai . com
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Store will provide passionate football fans with official fifa world cup products for the worlds most famous national teams , from player shirts , caps , sports accessories , footballs to souvenirs and novelties . prices of the products will range from a few us dollars to a hundred odd us dollars 商店将提供多种fifa世界杯专利产品予足球迷选购，包括各支世界著名国家队的球衣运动帽体育用品足球及多款世界杯纪念品等，产品价格由几美元至数百美元不等。
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