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: '92e2f06fe9231f6e',cH: 'yeNCEYcGbYTBZjRzlx.H2FJxEmxCCh32jjyMuN7WDTc-1744295395-1.2.1.1-S3.SB_cLPaPguqQCnK5Ve0rSs_3nPnLol6pXEt68HZV3hohdy0bYzblEEqMlBrCP',cUPMDTk: "\/1110.34037?__cf_chl_tk=XVt04AERBeK9kjbhVT2nFysx2kZaU4fBa4BJwr2wGkg-1744295395-1.0.1.1-..E0xE90Muiw3N.jF5T9h25MR67KaB9V12cerN5NQXo",cFPWv: 'b',cITimeS: '1744295395',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1110.34037?__cf_chl_f_tk=XVt04AERBeK9kjbhVT2nFysx2kZaU4fBa4BJwr2wGkg-1744295395-1.0.1.1-..E0xE90Muiw3N.jF5T9h25MR67KaB9V12cerN5NQXo",md: "YEGTjbFtf3nk6b0jZvCptkfGjj5Kjfe2g7kpL2HSvbc-1744295395-1.2.1.1-9Wx6yyLoWvy8dEIETMj_DTtMwp5ONLF4rf3T7aTd760aD9beRYBVPicoTxd0xozDTTGoxVn44_Kprb9_EjVD7sbkGa52fncFJoDA9Q8bpUWelR364xf1jdTPeSoLNFyGCsvfgfXHS.e51_eqy0L5vNKcaBgN_WFtKhMiAyJwglDGLSoPRXlgLfDMve0DqH4lGuaDWM55il1.QIVQeD76485a34HZxH9deuxBQJjUUg6CZ1yEBooZYi.erUmGAdbmGatDRxMGESUcSWVwh.iaIvl4OWvWsW0_cTIUzN8.QIS5.m.mA2.752JT5bkETP6rK4PMKcw46.OjBGLWhZUp3Ea7.sHNBdxndKjlMRNK_tuFtYwYF07G9EUfj2rgF44Cbfuq7jvCE_T4ZaRvJBhZRyM1Kfx6iOE5jMwzTD5dC7CI.a.Di9N384.9RsRVWWz1eKjRNxdhrfPYn5cMGzIaq5JwviEwRPCAUTI5ekMPNgD19vtgXErbIjCOXWLHayWI7sLkyPNWn.5drhqr7W.et8tDTwv5SBucUvC33GIhr6O8RZqXekdU8_Y3cFYtj9uZTeH8wTVYYlqwzGvVywjUzmX9G8Ust6JLr_xfhyV6pkrdZJMF.Tv8_qb4NxzoGESqkN0.QpfQiWnO.6TpqreTzQtb4z88zYkAp5yPKpSMkAHTJMQw77EuTRQ_X.ynfznlbC6b8lSLVp_tpMZS1NpS3SRVyzkmX2ycEAfSxLSKBUdLYFlMgqct.t4k6Vg_bIz4eXdkpSDjDhnC0ibWxiZ5hkpapinVf.vvF58XzKCsBubczK_vCBM5QNjRYeFRsIvroRcsaNtWchwdBD7DUVkYNNiRSkUeFS7wQC5yRUmUnOpeCTzxnkR.UPubJ9zMLvguzqJsTPHx0A2C5Vec7Z6QmeGcOHPsXu.GHAvdMJB3FneHAwuTMidtA9d2MwW07uI_cO.TcGq_26ZKBXsvB7L9F_6VJLw1dKi04bv9xSybjcGgADEmv8p9EeuEwDc85Tvf.rTqPYsilZ5bXNmQGk_8QYfJ5.lPpEIHJvUDU48JGMvi9RiMRRUO7TAkU39GuKQs66STDSUg2BcFdVBZCm11zex7YiwPLjLhOCeR.LV3cxJEDhY9zYOdkBkUACi5RL7St4GmPs4XLeBnjWsmQyzim61DATJ67nTxuC2J3XipQAs1pnDMRpFlxtcSUzo0RFEj",mdrd: "zaVq5O0mcE_Ahq9IKa.NT0z4Rmpw81HstCtZp0hW7IA-1744295395-1.2.1.1-eXiAk3s3l_9YnYpMNeqhLW1S6MLPDQVOggHLZ_zrdEom3iuMstxw7.14P_CVMJaEVkvf7JtOl7Y8Oh8D904rsS7OQe4Ed6AA3hicSrX5dzyn552TQKgm6IUzl8irGkMY5UeZ76ESERKdeiUJIeM9JJzqS7TUWL82HPevwTSkKHDjhyIZa8osVa6vvssI8vX04Xp00_ZSyfHKxAhGEAiYYnhJQiE6REOdSa66n2X29ZyqX315wz2yMWfk3CjfB9nerflYpO.zE9pIlZEw2p.b5nn.9r5o4_En1t3ERAyUxBFHlD5eQTknZxhZlCGOf99r51qiig2pBgD_a92x8UPNBp5SlGy7t3ErMYnT93MAJiKi8nXCjCfpt8svrl9VZpPSO2zLQTT84SLtfXtZj9rTPvD8sD.NxPyMwfY5opmscSvsXRhmi6fw1DZ4IVeTa3ULTbLhrExYaCSVa4OtNJes.JsvtqZrFbQ_qCxNQhqVwR9xD0JZxvsZmkNsdj0Zk9sU5HGMd0GnjLBmB7roAMGXxxWpu.yRPHrYvSbTSVSXtDwYgi9TXW3OXd9A53pzSZDZgfzrrtuoWummHfWMDATV.4lWz8_DburNW1DkjdDyj27KT3gCnmqMorlszRiV5KG85ZdukN2WGlBo6bjO9eZJrFoDeMkEBCEShSWdYzoIgJ0KdfgXVH3y4MlcBsbiaQlzFlXTutgO53rMqESonQjfaRFX6S2tyV55A6unzCJSjAEJS8Y.LGcFpKLQ4GAMgU4iHA5WwbjjznHjtgeTd95Yk2AC0YF14oUs_5BE4gouemvW9l58vNkAFTAdDX1UmtZSEDX3aiSDOUw7uDdNX6A0ms5dX7cIe90nba0qqUlG7ZYYOJ2GWeTGrDLucsvlnXP1nxZvJw_wbbkc1eloRPWO3sCMdv8uek1xFpzK4CGn..qGOtSY_RcddMjtRDZkwHmmTYN0srqCO9uSV8pe6z5gMV_D6.LfzIEvDlgy861xsnACNBhw24gMIsUUjm5uADI19CPFQ2WglBKNW0jDAhsvqIRtqnDibvrES4tpsEKsrIY2d_YqRWP2l2Ff4WVqqCI7Ii03DjJfWAEN2BaNF6gYYzXWGTIT7QjPQD2UkuO4Y0yHJZxrylCA1zvQW0r375jSgtIpSQQXiQ02a..nRfecXIP70WJG0Fp_JhkRV4xIRvG1SnM22az0APD99JkHUdhw9jo7.S6EoxXGg1BVHLpwmAMe._Bx3A5F63hcorpmC79kZUhZ.88DOiFZJo7Yaz.25NO9SrZjzFI1zlshFsgY8_cxU76AYxx6EdFQ_bp6nP_KMTngEWWglO0KJyX7L.dcpGdh5qgTr6FT5TyQA2tMDGGpgvtIxG.dE9.NeuRt8_cklV8F5fXxfWwOUAjdiBI4xZAT_q.2N0A3ntx9g2leHnMp2hHZ9oViA_A6gEixhvfaOyxEINRQCYrV2svNHvtrinjVvWMDcBUxEP2jfReZ_ildVfZ90TeNiiFRw_d_xUPUeP__YOWwwJtzBJj_yeQT4A_qPUzd5c_8.MVhfXk_j3usQk40YVGvpsHTpiPe2xQB9SfyqXxrLrbhRpkJwqgamd.LAjIXqSMUiQWACYVWTHSt7FLHhqxOZ6m3dBTguO.Rm3a6v81MpQCAAB6ZWObel1a1w1l61Qz1dy3c4Gp2as_qvkEjKHm7XIYSw.a6iz2m1aXkis62JC0lsatF5DOcCu4D9JmgqR604HwJiZZvONJPk7Crh4hrWWZt41fFOZsWLvbqUHufwsmwjM0nQSK2WhB1zQAY_MoIJDOaP04OWKoWDoqShOzxcDLzwc5ltXrlnodvrE.MvVRTW9KTy7BuM6rIeFNMx74k1vSk5PvIIeEQBAtsX5sGphpe6eZ7Urrn3Pbsu91eH3yd8pB3mLgEKamCv8vWLnd7hcMVE_y3dL_0UsGg1PYQ51j0ZQYVtqNTZn_HhRLHItyYA5bnW.PbgQ92lQwtRzW..dGERUriD0iCBzth5SCWPutcz5fHEXxRUdaxlkGnW3XrilmfWO45QF21gd50LkPZ.1sgumZxpg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92e2f06fe9231f6e';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, "\/1110.34037?__cf_chl_rt_tk=XVt04AERBeK9kjbhVT2nFysx2kZaU4fBa4BJwr2wGkg-1744295395-1.0.1.1-..E0xE90Muiw3N.jF5T9h25MR67KaB9V12cerN5NQXo" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>