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1、第三讲连续与一致连续一内容提要1.函数在一点的连续性若函数在处的邻域内有定义,在点连续使得,有.注1若,则称函数在右连续;若,则称函数在左连续.在点连续.注2设定义于区间,,则在连续的充要条件是,有称之为连续的海涅归结原则.注3初等函数在有定义的地方处处连续.2.间断点的分类若函数在处的某个空心邻域内有定义,在点处无定义,或在点有定义而不连续,则称点为函数的间断点.第一类间断点(1)可去间断点:,在点处无定义,或有定义但.(2)跳跃间断点:.第二类间断点,中至少有一个不存在.3.连续函数的局部性质(1)若函数在点
2、连续,则,使得,有.(2)若函数在点连续,且,则,使得,有Adheredtocomprehensivelystrengthentheparty'sideological,organizational,style,system,andfocusonfightingcorruptionandupholdingintegrity,continuouslyimprovethescientificleveloftheconstruction,inordertopromotesoundandfasteconomicandso
3、cialdevelopmenttoprovidestrongprotection.1.theexplorationandinnovation,strengtheningtheparty'sideologicalbuilding.Persistinthefirstplacetoideologicalconstruction,strengtheningandimprovingthetheorywork,persistentlyarmthevastnumbersofpartymembersandcadreswithth
4、eoriesofsocialismwithChinesecharacteristics,strengthentheidealandbeliefeducation,establishacorrectworldOutlook,viewsonpowerandinterest.Advancingtheconstructionofstudy-orientedpartyorganizationandthelearningcadre,establishasoundlearningsystem,continuouslyenhan
5、cetheoverallquality.Furtheremancipatingthemind,improvetheabilityofintegratingtheorywithpractice,problemsolvingandthecombinetosolvepracticalproblems,toimprovethetheory,combiningknowledgeandimprovetheartofleadership,adhereto,whichwastopromote,inanefforttopromot
6、escientificdevelopmentandsocialharmonymadenewachievements.2.workhard,strengthencadre.Stickthroughtheconstructionofpartysystemconstruction,andconstantlystrengtheningtheparty'sleadership,organization,andworksystems,partysystems,monitoringsystemsandthe.(3)四则运算:若
7、函数,均在点连续,则,,()在点连续.(4)若函数在点连续,在点连续,且,则即函数在点连续.(会证明)4闭区间上连续函数的整体性质(1)有界性定理:若在上连续,则在上有界.(2)最值定理:若在上连续,则在上能取得最大值和最小值.(3)介值定理:若在上连续,则,可取介于与之间的一切值.(4)零点定理:若在上连续,且,则在区间内至少存在一点,使得.注1闭区间上连续函数的整体性质在整个分析理论中具有重要性.注2介值定理和零点定理是讨论方程的根的重要工具.5一致连续性设函数在区间上有定义,若对使得,只要,就有,则称在上一
8、致连续.注1在区间上一致连续使得,只要,就有.注2一致连续定义中的是对整个区间适用的,即只信赖于,而于的位置无关,不论在的什么位置,只要与接近到同一程度,其函数值与Adheredtocomprehensivelystrengthentheparty'sideological,organizational,style,system,andfocusonfightingcor