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: '92ea521ede64ca12',cH: 'VWzhgZ_jmwcWjpv5YALXQx6G_mq5IJSLXlr9IwjJCJo-1744372797-1.2.1.1-gGKiRR7D4gJSKwBQgiT1.q1z42Bcav3qBWQ4NKCYbpEwUths0KoyW_U_pqfroefH',cUPMDTk: "\/0684.47028?__cf_chl_tk=VbKSnsbdEVdrKmd2Z4haZvamSdg3N80DwmnPq1d8660-1744372797-1.0.1.1-JDuP1cFWjBV9r_4HAgWQMoVRiW.lVZdDkz9cSfjDy9A",cFPWv: 'b',cITimeS: '1744372797',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/0684.47028?__cf_chl_f_tk=VbKSnsbdEVdrKmd2Z4haZvamSdg3N80DwmnPq1d8660-1744372797-1.0.1.1-JDuP1cFWjBV9r_4HAgWQMoVRiW.lVZdDkz9cSfjDy9A",md: "2xfmjJl6V6KG0SKPwzVvMu4QYDgyl0FeEkxH8bF9_ko-1744372797-1.2.1.1-P4sx.Gt3fa81lTh0AdptNMj92ni4Be2nqh7hTzOrZtOs08qSbY_bJ1Ms0pGRp7I2PzC6pn7.pRs3RqelkqYWxnDRROoCWsy4myEjsiXi2ZgEAW4ITUUcBL6zpz.MEbxNS5HTdvraJWz3bEyqzucWdDmMqSPwUCucXuUxnfSQDaUXbuOgA6.RfA5Hym7bkSzCiXlzUqwuMf5fQOIFmxPj8.MFUFfK3WtAACfJ6Lga1r.S8.9cOYe.QSGM_tnwOuGz8f7D2jt82iKwpXA4GrBQ0SDgI.wNDeslVoHNHrmH5sJpqlr.JgHOPs5oJyBRAyP_nykV5dudMH3a5KKEn07Y4xAAwWTAbqgGd3YZpf7wPjosuUPOvjq7WO0hdrCJpUR5OafMs6kWUY1RVEiUvsDmz1gZKCN4a9SYmtvr9lpcVo2g4x3TeY_4toYLGhSfTo.XeT2SX7Qp1LWIDrbLn6UEjoL3viP6T46X7uiCAVFkiVfUNnNUm1EMGGHrTyKenbYzUNv90bJQX36pIHCWKyjDUvX7B6C9YTsjA1U0In1i3asYbxxKuEKCwsNVDvA2PgHrUx31YaI7y5xEe1w9Yp3bY794QEKiXcRX6k0ROjv3oTIY490SJDwZLnml0g4A_r1rHl4oIqnMMq1w8oj8wF7_ptXUuppzIymNeoU3UB5iEsWdY5jp3jolP1sA3iej.lLTybgFSsCYCl5dYoBFpDYkNPfL_wZUCFQUZLLhYijppe4n4nwa8gHT0n82fzYQTDY6OSMQJSMrE2KoH7UBU.PsyUb77kaMxB5QGfsa0WMkArKRtAr17q9F3Sg9AUEWcXGLxDYF_9kMVbf_hxibgrIseJOM9lbudelEQFw6d2SB6hX942om8OxlhPypdV_DNb1GCogl1kk1jqgZqENU3xlAij3TR3EhE5pIGVFlmuYXugWVhmxXRwBeMK3HEkDtkTjfiwKBiGXWkNb8DRmZPD9C4GhtFMPlTy2FOWmyUyFlaAJsozm2O8QOMOtX4SPWjN2rtntowSzvrZUKSRNWLfC1ab3obZtKL_mNOsiN6mvW6n1nEHFu3FBf9yWxOLQ_Auj5cCtznTwyVkvMcDzuSG7kEunMmZAlTb9re4.k6R5KxmsNd2hkZgWAx77y4.y1uod6BhEWlFF0sSgk1bBksrVbWxeIJ9mp7SuHREg2YKYk0NBiLPfr7rCnFe_DHrs3_wA3",mdrd: "lVO5SM9atGIMuzGE82dHouaL4QzNkRlp0PG0vmioLok-1744372797-1.2.1.1-Uvq6iAu50SBMzzB5ycLyNjyxbaTKuLhLxrvPUWU1nxTXu7yoqhlRgYIu0PeoQwn_p0daKzxYtlEtLuuCuIcnbVrUCTh1IIlZgQpe4zZMVNi8NQMdEOvscfVuB372e8qRnumJGd0vw9aX2Z3wKUG2hVPxmtQMVaRWyBEM3B_z3f37Zn4J3nzeZjkntwnPQxuvNP5hA84zNtxgtKvAj_msZ.UuYnCy.FOrKI7jNnQezOUxMP52r2ET78WyGeH4pLeAbtLGktIPHWlR6qpl5tRAXB55XA.lqPykPScsrgLxdLNvvoMNiDOKqHtOErn_AFzUi3C0h55vmhMw0rqTEZmnUfxmq8H6aC0wDwOLeFCZeB5T7Xvu.xJ7PixCR.7JBHE96FaMj6yIqFa0XxPg3bqu1yGEtc5oIo8xs6X54q_PxYuXfZ0Fd8T.Wxmzo0rUVbEHjpJx7STeHCPT_7fDPiLGkIp8oa8xnTr2F.ntXAJhok3aR7ul3n3BY_mLlule0WopTK1sD6Gps8vNGicVuepAgRex4PQRk3pCIqaBo7dyMvLVVNfv1Dmrd8WRGAJRDM9pNvifv68t7bR4dpyYnEgYhdsbCC4OvUicpBABbm_ADOxWssz48Q8RjUL6AtNGQxFHvPAnN7cm66gFXc6JypJu8nfjKnxfZwlXAsFb147oOkZKJAjE3mvGXFUEC2UZ1Nu0x4ZPZc.b_FYffZ8_QsW8SrEJUCAnWPXDEG4JE6i1_twk2lp2JvwFe9RbSfG5W6Hcb4ywWS.LqXymrAH4GOj9NuWKMslDoR4lbrwe4BJT6m1m4GqxpnGHjk5GFQoOtM.Revcamb8hymXp5Jy5Kggj8MF0h1uifW8fb9iYPB_vrWTwzYXnJFi6FE4zmyTkQSmtZxXNjQFgQG_gQgTL2qBCAopUB28zyHpXZP.jiB5FA3x2fd2uLzsx2uqpG4jbZJZyTe757Ipkz2NmsBVJNN2VNd_yIK17ZIVaWKauvjvjsBD9I0PB8Mp27KhVltzl3q2yrbmBX.nCfm43sKUBs0eyEK9qfOWkSX5jSLnu4uFVob0_4ohUZ_qiV3CxseJVROd5T1CztRzUofeQCDrpl3.eKxi8hgv1c5L8_dxZbo3g0_WeqdQKMB5oY1OMa0fVrTLH7eeYyZP7c.bomK4OAGMtCvkWldt6ieaENavmedp4UqqYcg_ZOgZkv0gyqCIcMAMq00TmDvMi6Eu2a9DLLR0OHvZDmCMFpPQg8yQFtAY4HOX_bEAMw_xa8sle2mzIn.fiqryomW9MMHDWTY.e9Vsrk_BNJQd6WQ0FGaPNF0nNQnE.G4kxNX_PbfweUja6c4pG4Ubd5TwPGvlVdZ0lbt1_xSW2lVzIkKcku_0LjBBvKJv3p..Eqg04FuPYYiF.Cn6gIMOd6h0kXcWnjvz002.9XLUzTYFaI3Cs.qlSOHf6nMCPeeuTh2Q3MCw3Yd3.7g.SL0aFhOMmnmzN3cUduK0VM.I1HqUDvpJrAo4uKIEA9Ue1K_UJGiwBZNfRiz3c73ZJQqnH3jy_ggqv_PYz20M8raOJb7q06CiPcDLxVS5_hmbXHIf8C9cvEqAfGIjPKcd9bsYoEsQzj7Mvn0qPSiOZQ4TSv8PdqXCiZFwmcR9SF0g1DE5X0CPMuqX0h0LM4oB4pZ8WHl5zNU18ZPRMlGjH9YNF4LSuZcbI9_TpurkHpvGgKfk3uF9QLbv6JHfpXwU94Gb6peUvi0AF7TqLnOQ8kalUdRVBRb.2ItkWPfDweKrpXKonfpXMjT32DnomCOGiIl3BG1buR20XCwIS1Njp_Lh1MTzWvoqLCOR09UgXe0.SuBoF18JDWksYHGPrDNWYYS33rFy1Lbn9k5pfe4a3QDgAGh2zGw1V1G3EduRNRrgYgyssKFSR7LbSmf8PU.7w54BBAFQBvL9wgNutvjDBoG5l0LSKYoksVq3J4LxJ.eq0NaPD.Yz_CPX.snQL0LIYWCQw3dF0V1ygWT96TIdSKtsr6wbnsRGsCCOZIzvktGDx52e2Bq9ZwoSbikpYCuMi"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92ea521ede64ca12';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, "\/0684.47028?__cf_chl_rt_tk=VbKSnsbdEVdrKmd2Z4haZvamSdg3N80DwmnPq1d8660-1744372797-1.0.1.1-JDuP1cFWjBV9r_4HAgWQMoVRiW.lVZdDkz9cSfjDy9A" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>