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1、第三講連續(xù)與一致連續(xù)一內(nèi)容提要1.函數(shù)在一點的連續(xù)性若函數(shù)在處的鄰域內(nèi)有定義,在點連續(xù)使得,有.注1若,則稱函數(shù)在右連續(xù);若,則稱函數(shù)在左連續(xù).在點連續(xù).注2設(shè)定義于區(qū)間,,則在連續(xù)的充要條件是,有稱之為連續(xù)的海涅歸結(jié)原則.注3初等函數(shù)在有定義的地方處處連續(xù).2.間斷點的分類若函數(shù)在處的某個空心鄰域內(nèi)有定義,在點處無定義,或在點有定義而不連續(xù),則稱點為函數(shù)的間斷點.第一類間斷點(1)可去間斷點:,在點處無定義,或有定義但.(2)跳躍間斷點:.第二類間斷點,中至少有一個不存在.3.連續(xù)函數(shù)的局部性質(zhì)(1)若函數(shù)在點
2、連續(xù),則,使得,有.(2)若函數(shù)在點連續(xù),且,則,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)四則運算:若
7、函數(shù),均在點連續(xù),則,,()在點連續(xù).(4)若函數(shù)在點連續(xù),在點連續(xù),且,則即函數(shù)在點連續(xù).(會證明)4閉區(qū)間上連續(xù)函數(shù)的整體性質(zhì)(1)有界性定理:若在上連續(xù),則在上有界.(2)最值定理:若在上連續(xù),則在上能取得最大值和最小值.(3)介值定理:若在上連續(xù),則,可取介于與之間的一切值.(4)零點定理:若在上連續(xù),且,則在區(qū)間內(nèi)至少存在一點,使得.注1閉區(qū)間上連續(xù)函數(shù)的整體性質(zhì)在整個分析理論中具有重要性.注2介值定理和零點定理是討論方程的根的重要工具.5一致連續(xù)性設(shè)函數(shù)在區(qū)間上有定義,若對使得,只要,就有,則稱在上一
8、致連續(xù).注1在區(qū)間上一致連續(xù)使得,只要,就有.注2一致連續(xù)定義中的是對整個區(qū)間適用的,即只信賴于,而于的位置無關(guān),不論在的什么位置,只要與接近到同一程度,其函數(shù)值與Adheredtocomprehensivelystrengthentheparty'sideological,organizational,style,system,andfocusonfightingcor