2018年高中数学第一章常用逻辑用语1.3.1全称量词与全称命题课件北师大版选修1_1.ppt

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思考】,下列语句是命题吗?(1)与(3),(2)与(4)之间有什么关系? (1) x3; (2) 2x+1是整数; (3) 对所有的xR,x3; (4) 对任意一个xZ, 2x+1是整数.,1. 短语“对所有的”,“对任意一 个”在逻辑中通常叫做全称量词, 并用 符号 表示. 含有全称量词的命题, 叫做全称命题.,2、全称命题的表示,【例1】,下列语句是命题吗?(1)与(3),(2)与(4)之间有什么关系? (1) 2x+1=3; (2) x能被2和3整除; (3) 存在一个x0R,使2x0+1=3; (4) 至少有一个x0Z, x0能被2和3整除.,【思考】,3. 短语“存在一个”,“至少有一 个”在逻辑中通常叫做存在量词, 并用 符号 表示. 含有存在量词的命题, 叫做特称命题.,4、特称命题的表示,【例2】,【例3】,课堂小结,

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