鞍點

鞍點（英語：Saddle point）指一個非局部極值點的駐點。

鞍點這詞語來自於不定二次型x 2 − y 2 {\displaystyle x^{2}-y^{2}\,} 的二維圖形，像個馬鞍：在x-軸方向往上 ... Forfasternavigation,thisIframeispreloadingtheWikiwandpagefor鞍點. 鞍點 Connectedto: {{::readMoreArticle.title}} 維基百科，自由的百科全書 {{bottomLinkPreText}} {{bottomLinkText}} ThispageisbasedonaWikipediaarticlewrittenby contributors(read/edit). Textisavailableunderthe CCBY-SA4.0license;additionaltermsmayapply. Images,videosandaudioareavailableundertheirrespectivelicenses. Coverphotoisavailableunder{{::mainImage.info.license.name||'Unknown'}}license. Coverphotoisavailableunder{{::mainImage.info.license.name||'Unknown'}}license. Credit: (seeoriginalfile). 鞍點 Introduction 數學描述 檢驗 性質 參見 參考文獻 {{current.index+1}}of{{items.length}} Date:{{current.info.dateOriginal||'Unknown'}} Date:{{(current.info.date|date:'mediumDate')||'Unknown'}} Credit: Uploadedby:{{current.info.uploadUser}}on{{current.info.uploadDate|date:'mediumDate'}} License:{{current.info.license.usageTerms||current.info.license.name||current.info.license.detected||'Unknown'}} License:{{current.info.license.usageTerms||current.info.license.name||current.info.license.detected||'Unknown'}} ViewfileonWikipedia Suggestascoverphoto Wouldyouliketosuggestthisphotoasthecoverphotoforthisarticle? Yes,thiswouldmakeagoodchoice No,nevermind Thankyouforhelping! Yourinputwillaffectcoverphotoselection,alongwithinputfromotherusers. Listentothisarticle Thanksforreportingthisvideo! {{result.lang}} {{result.T}} Nomatchingarticlesfound Searchforarticlescontaining:{{search.query}} ThisbrowserisnotsupportedbyWikiwand:(Wikiwandrequiresabrowserwithmoderncapabilitiesinordertoprovideyouwiththebestreadingexperience.Pleasedownloadanduseoneofthefollowingbrowsers: Chrome11+ Firefox4+ Safari6.1.2+ InternetExplorer10+ AnextensionyouusemaybepreventingWikiwandarticlesfromloadingproperly. Ifyou'reusingHTTPSEverywhereoryou'reunabletoaccessanyarticleonWikiwand,pleaseconsiderswitchingtoHTTPS(https://www.wikiwand.com). SwitchWikiwandtoHTTPS AnextensionyouusemaybepreventingWikiwandarticlesfromloadingproperly. IfyouareusinganAd-Blocker,itmighthavemistakenlyblockedourcontent. YouwillneedtotemporarilydisableyourAd-blockertoviewthispage. ✕ Thisarticlewasjustedited,clicktoreload ThisarticlehasbeendeletedonWikipedia(Why?) Backtohomepage PleaseclickAddinthedialogabove PleaseclickAllowinthetop-leftcorner,thenclickInstallNowinthedialog PleaseclickOpeninthedownloaddialog,thenclickInstall Pleaseclickthe"Downloads"iconintheSafaritoolbar,openthefirstdownloadinthelist,thenclickInstall {{::$root.activation.text}} InstallWikiwand InstallonChrome InstallonFirefox Don'tforgettorateus TellyourfriendsaboutWikiwand! Gmail Facebook Twitter Link EnjoyingWikiwand? Tellyourfriendsandspreadthelove: ShareonGmail ShareonFacebook ShareonTwitter ShareonBuffer {{::lang.langAbbreviation}} {{::lang.langEnglishName}}-{{::lang.langNativeName}} Yourpreferredlanguages {{::lang.NameEnglish}}-{{::lang.NameNative}} Alllanguages {{::lang.NameEnglish}}-{{::lang.NameNative}} FollowUs Don'tforgettorateus Ourmagicisn'tperfect Youcanhelpourautomaticcoverphotoselectionbyreportinganunsuitablephoto. Thisphotoisvisuallydisturbing Thisphotoisnotagoodchoice Thankyouforhelping! Yourinputwillaffectcoverphotoselection,alongwithinputfromotherusers. Ohno,there'sbeenanerror [email protected] Letusknowwhatyou'vedonethatcausedthiserror,whatbrowseryou'reusing,andwhetheryouhaveanyspecialextensions/add-onsinstalled. Thankyou!