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: '92d82730ee0f409e',cH: 'tXDMiGuN4uqO3H9JeW4EjLD_GhPWU.VJJSfn.EMyHF4-1744182295-1.2.1.1-fRLCfjwDRaewoDXWkaz1yvaaXllwJ2KuTlfCE4VukGrN4pH1WykPVwbnP49UOhFh',cUPMDTk: "\/1476.94033?__cf_chl_tk=S_INo9Up5lcv9cWaYBp7QxamxjTM6aCJllkOOF55d5I-1744182295-1.0.1.1-2lOb3CCI4myUnIO8jOxGCyxtMXLa5G5HMI0VHtTXxpQ",cFPWv: 'g',cITimeS: '1744182295',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1476.94033?__cf_chl_f_tk=S_INo9Up5lcv9cWaYBp7QxamxjTM6aCJllkOOF55d5I-1744182295-1.0.1.1-2lOb3CCI4myUnIO8jOxGCyxtMXLa5G5HMI0VHtTXxpQ",md: "PpQMN3.zJZ.BN.5lvAtvSYAvKQfzlEwQbCyR2LFxt_s-1744182295-1.2.1.1-bv5FeTZ21yx7OeftsAqsBsG6wC8m2vKdS4y9pVskmgzF0sEF3DjVgbeTciv2Th1l7z.SI9ZJu2tL92Qlg_hKQIdYNn8gO_t14eM11pt3v56xb3MkWXmotjRSBLCm7jduQwE31lSb6GmKU57Pk.tnMGzq5120_S1juwGDBBMVzf8hL93iFIchIkcQCzitbGm2Uh04bzoWb61fimhzEL1UmD8Uqa_s8GpC9rZBXlAdjq8AHJJqFyK.wVFzdomcFyCvJmZmh4WJB1eW3Evfui0v5U4Ey90O3OC3igWDwfhCln0MW7i7KC5eif9QvgV4Wkw8lFcgemERj90TZM1mJGIAA_g0d172Q.CWZqMd5CHZm.SSKvVde6mOufF8ieOlMZJbGpb56WLVAVyKQXvb0Lds4i66t61bgI6xp0Cl0Kdpu.RJ8Ey9E3UdRhtFQF3.ZB0uGT.175Wr3XVhs10ezRATl0TYMsXx_wMLpKKC_KKMjUibVjbDn3Ixv02H0XGWOH6tzl.ydQLc1Ni73BTXnmjYj6uJK_8yA5DFw7aRfR3sJs5.EOCjmwkaDwhgWmYBDrvgDsZfVd5VJbZA3K_lAj2EUDVJA_jYmg3Tu8NXreEOe1eSl9TOdQdzFCUCrLXqPpQoFcZ06MWE..6L90uaSjxAbBRyhPMHYpGedVvnJrrNHKKmx.YSg971Q4EMtNFRNsrSNaUYVqepstkX5jk3HI_lrKhBUb2JuoAjC4m.bvT0Tt9q3P7L0P7mF8ZfNgCTprN3PS01.i8Sg9GkLo.hhC3zC9I2BeLRoaaFLEfavj0dGBdTZkH6yEMKjzgvW07y0fehiqMnYHVniaazma_.xEJ2CggbmMVhd8AvcMAPX4_Bio3UpsmV4QNpsgXE74iifcOHOHuxu1dfG7KQhSUdk3lIb3_tqq99llUvmptnDOYng1CKFRKv3IjDzA6.zcfeOjx7lvEym8nE2HO3pK6m9VAslCTxUBPyELOPK06vfyltXTNF0YkfNaXtBdICWcILVfDGtd03FDehMxcy5b_Dt5Kta8cGKZWKJ4.HfVpqtesnHG22HJ2cEWOxNZgwz7LgsCd3oRceOwzEF4z8GhqO41Tzq3raIy0f_dVYy96P7bAvP9aO1EmueIc6l5LjwuP0DJukYyHC.Yis9RomlQGjcyOsoTt0bzfdvO5.fuIlz65y3Hc7UAnKJ6JDygQhWQKdGrgc",mdrd: "q3.z09igjheqWNci78Re18u2T5Tdj8z7jO0I4gXwdlg-1744182295-1.2.1.1-S6El7I4NHCEQGve5mfb7f.25qvldDMWJqpN22.Ndgu4Ia5BqDlKT6FP8JrrH_W8Xg5PVKbop6QdE_pRKsSPnqa3rsbFbKmjuLmOPnjgiARtIo8VzdR.lZFsrBg9jS2L3NNqplCwLDO4kxlDJxacFx6jnbRs5LSBV_pWQ2vMIGvTeohmMAplixC3UDJDUP8sRcl73ZH3QGwQyUZEOOQxlHVLyEowT25HsRN.fkAQVT9IJqIsr9XSTobi2drI6J2Frbr8scGmEZmd3H4PBf73GdbhabZKe3r.iy6kzIIHVaf8tbRf60eMfYVgCA_7A8crFaoZh20asgDxSam7vEBpOP1cHaqdXzUgy2q1Jdqd_oPdA3Un5U.cb68o6FguItBgWB3xPtE6nEMs.LRRsmNEG.eHaWveu9I0kDf2T3ccYs14.BS1Lf_G3_eHRY2jg7kM3cfMpO5ZKtl21vCW7WY1lLXfi.50Eyl1DVDapfR0sB20rAblBnC.JbUIn8kjMQmojSZf6M3A6P_XdjCzSQsXLbdyXZRHdbgNiQFZw_L9CyH3XF_NUYAL_OtjEE8NajQE2BoYI24s67JV449jtYO0_Nok4F6OCbwAhxje3cPnV8lVVIrv0VeJ6B80vSUKcVyKOzP5MEUJG5DLBsJrRFUXlBhHi63AFdtnkDbVJIP5RbVNsWfxrDuhgriU.AIabq7F44bNTR0r_pjh_XjgTB1ZATxnQ280aZ3QQSJSvXyr9HzIk4icHh0tNWPuNq6zAoIyG9cu.A6mzIDvPD3FSe_mObrayweySFew9mohwDTBl7RI0CWh8k0Na5Z3VNUy_AOS__RXz5lUwgp9P9gtTt7LfrYfjx9ST0n7LiqsGdLNHz85SFWjf0PQiWByahZYrbGIDbaSNo26TdtOX0FBoml0x.XibJg1DtPV9OoWvG10tfiJRnRJRAmpR9ZK07NoY072M407F5ef8F5AC7efPlTfl.h3zPo9m.Jkb0kcB.fIIaW2UGtgXwqoNQDpUp.qtCp4GPfURaCjG1O35gsXQiCUQMWljj4se2aIuC2ApEZidqNOc2aC2KiNUYdNQgoOPLE2xj3UETYn6EUEtq8t7lm16UMyDQTj0WaEAt55yNSUEfIaQ8sqJXalFtDmPAypAcpAS6rZm4UEMzfiIWRWsbXZi0z2GgrDmhAXYlQhgMJUuU8YZFy67qwXCswdTyk8NqAxmEkIvCA9SGwjJZvcVoB2zi2wDAwlcZFMSWJQ44UxV3wTTTV47mgw9G7CJ2cClhTbVrySfUPxuciABdcs10JEBXMxX014H4Bz.gLXRkjIxNdP7fqhsji_OWylqtrvPhLoo75FEc5nWHiTCfdwv1EpeUwX.xC.iAZj1nPP06wy6W3PFxKKQljo.TuJeIBQVIf86xaCGMMNhyF_NwwgGh0j8jwKI6HbmMkGTo.0zUA8h4_DzcjLZYPyTICgjQ7UXiw6scYcH7hylE7hslScex9Ax9Qzrm4DroFKUYzQUjeuGLmCin_t_kWHxIXZABpTxibeoz_8rBE7VT0Nc5NmEGT_dxXoSblLKnSswj9C_ZqF379aDB5JTmi0753L32dRZYiouK.YYb5ufKb_lmKiXY4IWXHA5OZf1xHQmzYUkhQHU0nIMYVcYfd.LaT._cLc0_lFvOjawI6ULlq9Te9J0kTlJz9Md1hTaXJJkSdDUhAKwStXGJusK4loVyfCcUJ_RXNORhpPuHCDwoQkG5LVlfE2R3sbPSSK9CmVNk1jIR4cy9mjbsT_iOjzDD7Jn0S9PJch2OqrMzGVZrRzsYC_r1Mi_wqIyh23Xh0QLnbAATpHoDG5QPh30QvwqR0LBNRHwtMYSZJZBHMyblTBi.4eO0NLd7UiNumSEFGqZdJfhsmeaiWEQ9_uKkxBxdE5OHMZrbaQ.x1.cMSiMf3I3x6dt8CXdnsupJb5i0XYENsSUkb7Gwnr1gkRGYOj.RGYaJ8bx.Rz7wqLQG4CVFO2O.AQrXdpBsG9ed3DgA8rUY9XwTGDKh0CKGrGynyvSoi7kly5wkEzO"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d82730ee0f409e';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, "\/1476.94033?__cf_chl_rt_tk=S_INo9Up5lcv9cWaYBp7QxamxjTM6aCJllkOOF55d5I-1744182295-1.0.1.1-2lOb3CCI4myUnIO8jOxGCyxtMXLa5G5HMI0VHtTXxpQ" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>