简介:Yangetalgavesomecriteriaofprequasi-invexfunctions,semistrictlyprequasi-invexfunctionsandstrictlyprequasi-invexfunctionsin2001,underacertainsetofconditions.Inthisnote,someoftheseconditionscanbeweakenedtogetthesameresults,andanothersimplifiedproofforacriterionofprequasi-invexfunctionsestablishedundertheconditionoflowersemicontinuityisgiven.
简介:从阳光广场向右拐往前步行5分钟,就到了中华小吃街,在小吃街的尽头,是一家以宋庆龄命名的医院.这家医院汇聚了一批医术高超的妇科和儿科专家,专治疑难杂症,因此吸引了全国各地的患者前来就诊,也使这条小吃街上的生意格外火爆.这天早上5点钟,"口口香"面馆的小工李建设打着哈欠,拉开卷帘门,发现距面馆不远的街道中躺了一个男人,开始他以为是酒鬼,到跟前仔细看,发现男人身子下面有一摊血,吓得大叫起来.