CINXE.COM
Just a moment...
<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="390"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "zbmath.org",cType: 'managed',cRay: '92d6e4dc4e8dce19',cH: 'Qdlq3Tr71kw70bjGZGI9Skr4RWAKZw_EnLzbwOe6Ff0-1744169092-1.2.1.1-HafVXRueOucEzzZpRIkavM8ymRcD6Q_oeFPmY8G7YLbJtMutrYXN4qasiY3DbZsG',cUPMDTk: "\/0598.28011?__cf_chl_tk=wSgsD_Qvs2xpcotuZv8jS4ur2cQ34buUqdC3T0scxzU-1744169092-1.0.1.1-oPh_IqJf27px1HEMZ2OkXnkKzQZJqjA_NZ8h99xv.bs",cFPWv: 'g',cITimeS: '1744169092',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/0598.28011?__cf_chl_f_tk=wSgsD_Qvs2xpcotuZv8jS4ur2cQ34buUqdC3T0scxzU-1744169092-1.0.1.1-oPh_IqJf27px1HEMZ2OkXnkKzQZJqjA_NZ8h99xv.bs",md: "zU1iHGhKn.YYVxxbmNXBv24lm_qdlRd2qWtlkQ2eB74-1744169092-1.2.1.1-iDcXY40svhx6VYw8ix4K5Flo2dAv1LP4JbS72HegZxiExvbW8h06VqJJ28nUzHtqStbKE3tVb0PjIZheFRfUw_0YcMsanc_eupyeD7FKdV5b5wgYFmOZOY06CvPthSI2fQv85H7jYNkp4haZjuVg1_JVzmmRhPcx6vB0BZadjfSQQSCxPNSlF_5p8S1p6AzlVeUcHUQsFmkCMBSC7YiscCrD_LGZFD8aojIVCZntMcvuNQf_4WmXGDrO2XcmlA6O1n9vVXtUFhc98LuL0uT13ImUhzbgoDRmTp3ceYM2GUqxQDQAHdcDeJfpBECvDd3GICYSqMXuJEoURSKOs0WSV4mw.ZSf6Z.r05OCcXfh3QAHz68ZX8F7gNxsZ3KskkTi_Re8.2AVbbKSXDDKMKsVLsPgGYb2FkgpP7wk1Pnz7Qa7OCpKqnVQtseY0SozZ_U131QywItTGHP_R7mB4irYYFnJs5EYsoDX4QjywrDi4xK1LdQ9d70dzuqGhP5BW0s73_pmMlL_QXoMUBY2poRGWoilsMuVnD5H5qwAMsXqxbeSJf7MdpvhNEltugN1HSskuWqEc8k.10WLTpQafvI.QZ7yHbQAHk7lmKSJ2AhoiAOya30OmmpD.Gs7yJJIsHPQNwkWDgTVqSr9lUZ0mWmqPXoUihkIgpgr.ElF2xd5.bj2CP.DHXbOBAivAm0pjskBCHujM7Q2IpV3X.SwcFk.6GdpIbbvZiLbp5qgTdYTMPhONqlAElOV7J7PL_bUVqk5dvFIx.yt5KsNlmHWp.bSuV1aqvpDh6xcArNJZjCeZzdWC85iI0Gfo_IOk_ZBxHTAs2jnijYrWr1KEfNbU3uwX0v6HdS93kwdU_KqY4AIe4WIuFORdDbxnKY_TFJtRdhOhdkrWfZI7FNNnx_x.QlnSn_ylZ.vswdceZ1IwQejRWdkhMr0GAp2PugXKoa6NKm55fBSStFdpSIEUpmazqbgj5eiCWZ0jboC3SpepjhORo51UPpsJ6zUoO_zZc9vQ4TIApAXQVC2uvEwdza.k0JiDPQ7H11MTMvDXzdVMf.zp_UFxbs52__DxEw2ZFz0vfr_Sip5ye_qYfS22N7DmSBpNUgPOA6pPfQTH07R7Za1WKHPn9RR5TvEb_3ROuOuT4wv5M6_WAhBNUTEWxhuIxnaTjWSWQW85MjVK.ZPN_A3CWKYPGfr6F8J6EN60StIXt1F",mdrd: "CLLCabiMf7xIXiuIGpbn20DEXt.0TctNjrs3vLNrK4s-1744169092-1.2.1.1-yF3fSVWHMKRDYqFFheb4.HNwOeAxU9w2ZBacEblcoZHAiztCk_C21NoI4ny8zvhg12I1wnoowie6F9WaA9JGq3iNWI9aLqduHCo4PBclI7pGOkWQug0eEKYvYAoctt8hrEiKgYSiOkDC3qTCi3fCH1n21wfstPBHfpcC2dSKLsVQx5Be5YXsL5BjXJlWpGZwi8mxfM49ri1yYUJrQUt8s7iKLZItMPmCFaeqSNC92EJdKOutZvm1JoECCdr.vQKwxv0U6iGMivVZdrqfx_BagEpjes8M3l84aG87w4ncE4kzd5kwMxXn_N_mU.AFkkq3A03OYe5.icCpigzzcGW4z4ZaA_K5qYFlLYL3F95X5W3etaX2mw.hMtB_j_Se6qW63zXXlVf79iq7eacEfkOgGsF5N5JUVu26M3x3ZAQwdjaT6YW2oLx_KZR15j7dYiASVjbrBhaG_eM6gGrjgWA8LBB13zkBuhx3DkPNAa3vUucaqW6TH7wPG.t8ZkOpIfW2PAmTKtRKut1yXKdy1Cj0ivf3N6MbPcgXQiWSFwNvWOttLDkSJQLcEIA0eakxuHBw3grnmbpMTdgx.Hweo3j2HvA4Lj85aSDGg4fLmYixCTiNNirVBo4dhOmIlPTx1UldmE07.WsBKEPeCquhSAcmez9xmgyjdg_R.f8sXIohpeyUCyFGcLyVdhq8GWj7lyY218ZkvKNEDoWwpjRYFS1l2w2Re4Hu3W3u88ptMIqWDeDeYDm0TfE2CoDJQ_4qi9IPhqQqFz0bbCKcWHPnqh3RPeuaEINWjWhplPOYoQOne8IoYZY8ilAF.ysA65moIQXOhKeaNXES38T9eoqN.sbb247hRsMU9uo5FcpiPHwMX0G30cucjYhFWGJnXttV5mvHHjJW0EU0eeH5CgcyZCY2s4kx0YnsyHVt0xNngE7Xnkq63QxJsvJKGvNlWqrQtMsH6b7uEso_Ld1AXq2ZO1LMJIKnk4PWPfeeLacDXKZFi8E6DOqHgLb5TCjWnDLK245RY1zOypdaMMipo7mzvWzQ59qnouv9mavK525.dkAyg4l7rQw8RGJ9G4IWgqcEByaayH6AQtgJ.owUDb0RjvLMhXbaAoltmy2ZR.IdUI207ELvdONZ8T_n7nSzR3kiWwNcH_eekbqwMJ.kd1eElh2GOoGzGkWKXIEcy9ZNcj_HVfPPw_qC4ox4CqliH3LWJrxWWIh9Um.pmq_xCVHHtdqx20cROXXg0Yk_ndZTLCRGpNuO_LzCe_N8v.xiebTk_jS1Oh5vDmr2HNdwc2XCpDm9m46pKmqKJ_ElEdKnyXZFSWCk2e5YIsDPtc471syjOPkhPiwZNDq8_Tngw233jCqPLvkF13H.flQsRpm.Tj001snBjzpsnR9NOLl66TvfJM3tdViDTqiowICJL02.AWuLLHScSZik7O9mdApirowfJI_MG_kqzp7sq5khEJgk_A_Z4A4DzhoTNf4RAh5gZ4RnQ11ev_Nj842VLGauMWWvrkjmxcEtda1EvR4T4Vigw8dT65gApAAVbs9j0zhs6LlIccfZ4IIht.JJos2tlHI6sM.IME1eTb0PgkFu_Ggzm6UrqfuPwsT1a_wn0y4uLuK2hCZfjdfGIq5MsR6PbUsQUhjHH_Ck8buw5V6VcgwL.HCG1CSUUJ5TK.N6cqUbOhJ6YObIU4.K4XOimFbjZOVNSqAeIJ7FmIokAgHEixIg3Ck8NSPaHwkVgoVfucty7Oy9RjxraXMspG4k9sugS7e7lMimM7XC34TtoVxhmIz79etmS6aQYZr30EAAo5JQh54thkInSPvi7dlFcBy2IVIy0h5nXvccr8dyypI6HbtyIaf9Arj6lNE5W5AMSjcDAVBQVPxBEPN8yH1DAyIdGhzyertEwq96vzmcREzKYyR5WnnrTQmK1KLrKNTCwWnVWXXXmEBjxqjID6rz0rroMJGlx8PZJK6XxqeLRIVVzlrrcbdLj4j4_xgbY0guVrT2viFceFcprSm3FhMGF.Y9ZiAuzD.6Lst63F6wOA1aLUYhAxOQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d6e4dc4e8dce19';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/0598.28011?__cf_chl_rt_tk=wSgsD_Qvs2xpcotuZv8jS4ur2cQ34buUqdC3T0scxzU-1744169092-1.0.1.1-oPh_IqJf27px1HEMZ2OkXnkKzQZJqjA_NZ8h99xv.bs" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>