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: '92ea0af90b62cdf6',cH: 'kQtUngoU.INm3gL3ocI_SuL8LUgsOSKCqI1odW8FaWI-1744369883-1.2.1.1-A0OrIHK2n035vJENr.g5RDcJDMMoCo7lW5U4CA2h8odwtrycX6MkVlJ6ntuenQk5',cUPMDTk: "\/1470.91280?__cf_chl_tk=P.69zT7dfOXqbzf10Sld8CHETO1evqMa9EfKu6qRHvk-1744369883-1.0.1.1-mSJU1jMybH3WlN_BRe7Ba3uhP2oSE1BglhE1UPFeAhI",cFPWv: 'b',cITimeS: '1744369883',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1470.91280?__cf_chl_f_tk=P.69zT7dfOXqbzf10Sld8CHETO1evqMa9EfKu6qRHvk-1744369883-1.0.1.1-mSJU1jMybH3WlN_BRe7Ba3uhP2oSE1BglhE1UPFeAhI",md: "ezpZNeUek0D1JqbYHh8Dv91cQ2hGLZiwPLtlgSOBXJg-1744369883-1.2.1.1-IzIs8ZDX4SAp_qeBNqgHMSeEBhAh5_bITPX.ZyGPlDGV8c23VwKyGjm1u6Ashgcs1voJUroxrT9hHpxYg4FOo7ocgkTJu2OpGOzESLcD1UKnFvakmEXPPJ0P2gusEJ0mYldxNWf5ElNWmRkjP4JYPte4Hj1eH3Q2ku0ipjNlWrhkGfUmPkEMyom0N.4Prirnts1G0h95qRdMthIefgDlVnJtgt7Zemdy5975Fu8zzEt_3ly27GVK_xEDkKNDekXa.Hmgup2ZD3stecpkTxzjfcP5D5R4I0QK3riJSUcr5clU65qFnz1hhvVoeH0UY1YRFPWl5YG4xXRdIzN8YRQucC.AgOa4o5Eye67HPfGk3lt8x4dmyh75nlDgKACppT4TfQML4FPSHfkoFcGBWrdk5m3moKJfdKY_HKIJKhJEt2lU4_pZSH8PzBGg5Zdjfd8scWkX3IuJn2w_AZN1zRoDU4fLN1Um6dyIvJ6TsvBo4WhytCAw5gB29jrng2NUgNgjq.YB7AJYpfmAC7DVVOCVos6itxLDgGbySIUgXtFTwHub.EN1Di.Cg99dUyW6z6Vk4oZAMD9r7Ta0hicVtI7TOA9KTnRl1e2WOAXW5YxU4ZtBJkpYGAmdbqY0bFamXZmuJXng9.wXtFrTUck07RKcXi.MaiR8VnWADNqHZ6S6GyrQQx0d3WfW0RVPnqVmSF.VZAJ_tBrBDdKJXBRqgxKg.9VOVDg5qCrpvlaawkvPInOaRAkE9qihzp.D.OoPoHD695HL1hJfq1BWbbEidM1B0sRkiQ_aKLKP.tlVhhyvv21_En3Cwc5zn1nLb8BP5WqVsHVHkI2IQM4sYSvCMb6SEhInH8roo19NbW7pBMycQp_6JjAJi5T.MKKj9FUO9Qn_r6K21y9_pSyHMpnrMWgkKq2Cbc57kFrkEeCbIRPhUXH7duHURMheEh2CAw6l_VcRaVH65IYtLxkew1hVYMy.IRSUdgbhaRFOc9P9XAhju2C6fc6b88cWcrAB2oKgidsbe_E0TYdzmUkIWiR7GEvnhoOEAnzG49xiX6qYP3jMLUccwxnwXwhxE26an0wSh6wh0yvwiQc02GLIT0_wbL0B1JFgH2AWIJheibB6vWmsfOCSUOoSQd0yNXCeglvEKdPXMFF_s7rmbV0vdBNI7XgAOdbltbQ2Q.g4.jIlFsWAr9lpMw6pqugZTyoho1q15gck",mdrd: "5ZJgtCCBH52pPSV7CnZ.ImZyJaBEi.wtVlV2NmSWilY-1744369883-1.2.1.1-XdMY0EcD3nGwm7dwkLFveQdzj0tA6NmS7zDmJhOsH_n7wNPt6H1Lv7NqexLF2bUFdGh7qIYBe4XD4Ye9UWWUxC3kzzYE0CFknCEjYVg4gAxn_j35KQ5ANOZP5EyDozS.6RSjXZ6BmWK2Gv8eTtXA95wigFWEdvtCzbdqEXeQFHyXhebNMFcDwr3Kv1tx3LOl4mHAWns1dAqDUizaTn4i2pgsLNN.nj_o5HFSu3dSKDGIYn2TviPMYmL0f0drB8_q6AaV1P2p9PSrOuVz1jBakxnRr0wLbywmHRdzbE4QSwFvfWW6.xA1YPPyx63m2RlCq3xhtGgCU7e96TgdoFuEsaDX6qiYijewn0QyW2tdebqdq9sICLM4PolZKg4ovXBde3Ui0.OBHgL.sROm1Vmjp5vSBKHD8UuhY4QOwT8To4Ejid4ow0Yg36Sv5vB8EvHit3WfmJ_MlYmQ_ZUG7M2VNJPgyyooB4m1jnJAl8.SjCbTZzBlqICQeGnkGof2lu_p7oWZVjBrC3KY7K__dcv9L42.4xq1agLNIoNxgp.3XNNFJlcR.kQvFmBuFV_r9F7pgwLOuZxvOxu6xzSaSVcIIOCDhsKxKfQ.9E0xEqpS7wIX2bMeYZZ40aZiLYtvn8ExhX.CIHLLRE7rQO3O_uC2IxwsH0oxlsw9flC5IxxcadPcIa5Bp.HgLgB7IFf17DJRX97iuvnp355hSABGVXFYkW0gCLM2fmRHVy3YQ2vdpLoEAYAdvweP28WCiMTXIlWdQf.5cCqZ5kxHb9neaNFk4aUIxuh_b7u4S0Th0KDX2pI3_PRc0MsXnzri1STs3Z3MGsgrxpQcGZEUKMjsbApOD1.zFdI9VL886FAaZ_X1PBxFC8f3l0nbLe3uVtzkzIAGlB2kyIal_Hst88FAiVNXXLUmx5XHdNvEP_ST.2kHFo.Y2x7_0L0K8SkV1142m32rdWbOawhqF3AlF94stKWj6JX8BFq_O8Rnf4IUQK3JPW8Vs4GBQXg7KDRLigk5vwta38VI72.30WYDNFkOmhVXMjRgu5MGAQ6z5mnd5KYX_oDMzwNR93g8iRQuKJFi41YLPsEy8Qi5GiqVCYEKkigB0igk6yIVVV5U7jNA2Ti98JHiKTRGGKtIaDt9DZXOV9zt8eSXoM7Yl.Z7z4swtTS8dY.4RVcFXS1mip.lKBKNk18KJsk_qZV9ViH4HuLTOxwKG87VxtrNbcVluQYhItD9DmvuP_b.3LmQ1y2Aq8h8iQoacb5rfAdFs7swk2fWJ7aYC6m0zj1xQX4hhyoMwe9Shs4K_.0i86Ihg7gVlKHxEV3099F.ILJ5mM27G1u2lAGmN2CgcHGRhi8csyM4iNtEExnrnzPgeIxO8ea2h2Vy5cuDCGklpYyTYILly.lJRSy7cvcT.rT3rYc7jQZ_oZrr48FLOq3G8RH1P0OUHIv234GrC7llKn1Q3NorxXKM3c6uvjDIVh7Yh94b2yqkfw5yt7vPR1wmRshVUy7gybBYwTS6s6mM8bxJdoLPjDiW.7wdHpWIHCEDrUBVWD28YmN42yUlRyubGBJjbckqeM9SbIIkvWilK2mVVdBfl5fHGK0HcFSQypz5eaTd540XG6k.9qsHj6GQ3O1ogtmVDemJufIGWhB4VrMQ3JFmC1abvRv0vnlGudFyBluVZLLAV3U0niVnMhPGy5wDHxFLLzW0nuDBk82vFiUHdWTag1vPNsFn6v653C5LSqUmXKPu2DOT.fOe11s4RonLNr_JK65Nj1YgYuHMQYkHf3zmqL3FzNkvctVn0gpirTi4zXuvj0eP9bZ6019W7KOVNkjHrDCbeTDgwFt.4hCwRMbhdPWQdG7tWR.5VJbkFag4FR.k6b2ijXODMksv6ioyKevb82BEnGNdHPYFGas7G6yCpU.uxmn3IDtrtsBD7ezdEHuepzda6Nf7fQIyVXAkBmDqb52DdBLilm4Y58.mn2MP.KMpLtWY06JugjBj5efO_vUsySq5fiVY0YcDvzOMhIMy1tL4N5Ng5jIEMDuCEP4.RMXTA9z7"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92ea0af90b62cdf6';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, "\/1470.91280?__cf_chl_rt_tk=P.69zT7dfOXqbzf10Sld8CHETO1evqMa9EfKu6qRHvk-1744369883-1.0.1.1-mSJU1jMybH3WlN_BRe7Ba3uhP2oSE1BglhE1UPFeAhI" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>