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: '92d7500dcee0fe01',cH: '8YiM7RZE.MguUTDnWFyPF0k6B6hZvfKd24J7Dy_ZdtU-1744173483-1.2.1.1-qE2x8gMR.fOKOFV0RrzmQHSMa9NOPC0AtPYtG_Om3CUF9WOYT63rNRpwAuanfa2J',cUPMDTk: "\/1423.35112?__cf_chl_tk=dw4Ap0KGZoRWY0XmlPQoJHXCPvaLqPHUHnv1Yo9D0Og-1744173483-1.0.1.1-tc_ZakmU5yyuRxVXVxqD1z45O27ZTrMf8fygHwfreFU",cFPWv: 'g',cITimeS: '1744173483',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1423.35112?__cf_chl_f_tk=dw4Ap0KGZoRWY0XmlPQoJHXCPvaLqPHUHnv1Yo9D0Og-1744173483-1.0.1.1-tc_ZakmU5yyuRxVXVxqD1z45O27ZTrMf8fygHwfreFU",md: "ND8P2WK8dHiPo7qJ_eUz4eOiHFzId28a_rRTn3A8WY4-1744173483-1.2.1.1-AkBuXRJP_1OH7c2fP.9nvktGxatGN236Y4O86rDGtJpW.2qJ4haTlrtrJpiTw4NQsh5IrXUTkyw96e3yErqNFc0LeZuN.cpjO27m_o_iYwp7Q8d8W7kHvZx6MuOiIzLN2GPI6APsrvb3sjX_4SycfQkdqcroe8hEFHBe0XggZT4wRzonvXFalhPAxf0fOjylZeGguKWgKwU_l4kLem59hJuQnct_r_akdplfZq4g.d87AnaBqxsh.pH5_zOacetm7ZFqQPljNXD2z2YfxGTW.mXIZMRJLBhNnwrAAfje5h06jAu4dPekKNJeLmE.086Q4rQ85PWKfrzpm8WZLHLFg9W7sokHap8FZS0rHdnaq3zrpZD3lsAsB6KdBzfnPuww6rTWpt09XUaH.oRNDNuxGZMwx3Yn6nf8tULeUmG9pT_CF7q5Iv3dUwabXRr59FEK9xFn.O.DCzL3kadTjF3frDjRFXeZcfCBmzm8FGZZEFU8n8OH72kvvdQ.IH5edzLszEVqC2IC5zaCeo9W_k.o3Bq86nOWHQoaqz_NH6FfBTi7fRB99TPoij3GeXwwyMCAKMY_TtAYPZXszk8ZwFaay_1O.jkTBRDdgiGszyDIP700Hc_BQCNrDEQ4_SVuDfbA0BaKPYzH93R7YX4PeoHXlzKVZlcaS5mKDZJ2AO1_oL31cCoiVV6cDtAwMDeMt5Z_cb3edJVspQ873o.0UW4e0p.ANeeawD1.jdBmiaFq02hjPYtWJENu_ALgOd3I4qUYt.TEOtDOQ2x3Q7i1_l01qs4Uf5P2qQsKU.cnbS6STuZ.PuIubkfr7dTjsS0mNlmU8FaS6e13ft4U6Vt1bhsmIHvpR9ailoMnYh84QNXntO7QKslazR2sII3NTGSaDpfEATMBs0p8Mk2R.aWNVWEH_85PckqStro8zuC1V_.8P1m3AxKqJvVuIK8bZKuVRwbd3oJwkkw4YIUvhQ37ALVTspUA6Kg47NoLi9deaWOLoR0F5BQ3wf.iknrXilzeD81O1t8UawoE751A_X9df_U7aymuX9s0CP5szaOPxr7HnpUfqtpAZ.LlhKuFJJ6mX2hUs7thyNuaTslbCwV90E0AbkXkdWY3t55sLYhk0ZpuEt6N5yeXd1rD7ZJ66j2DUKT4cnFbec64.0Ypc3cRagY8G4yoodqP_yDvgcrLKEUdlPqr72ynMSuQjvNCyHdUV.vy",mdrd: "zRorYoWuKszHwjKdcjLXsrL6z6yltE2JKF_EBv09BMw-1744173483-1.2.1.1-CseEWnS8FYuWspcS6oMlBgLWJCLjIcRlZETkW4o__3UZCapqUBMgORuGrWDnScE.FbroyqfNSO7a1okw_Y5PUA2tTDhgsbrm7QfaV55mtv982z4aaAr2o8.NIpcyUlhSonW1.owu6Crr7bkpnBdbkLKqJH7L1nUStcVwODI_YFlHph9oz8N9zenH90ocOuu.Z_eECClnwcw2VWL.vWczQWWTAVXLXzYs0cqUKWHQs9bGYm3hQcaQWVfAq0MsfB8fsp_WeeM41w77k7KD6Y.q2PwE_X1RmQZ6y1bOh45lifVcE8q3DT14zTLdNBQUlby3HuIzt9nqhSJ9HeHMVRFaF6oHGR11bw19H8Xg2sc7KNzkUW084gYmUl6eFUSxL82ztVNVJqtvrvGaTaJSyqQnFKAIpgCakAeW3FeWbBMq4JGa9ar0Acjiw2TodCnedLz9lwqdsiaOC6TZHcusT1OtKEdaJjJRq3RnrCuutPfbdSN_eC.3C1Y6.rzIxhFeX9NXRKN9AYOaoTN1JJ2qy.m74wut3aKelfCwtTLFA2pXr_4EPGKXVvi.hSFCG43YC5z1_ctntJqE_cmRF4KVoAdHm04BVX7NeGo6Iwxay8QRNqiOJLu8OxHLYJokUEReRbhJKMpNX1opeoLDtF3yZtZW7P_L1yKqHSNZrWwGBWgI06ZOdY3hJSPuy4hc9EM.PBES2f3daqrkA4ejOJBivoQ51RE5AMQ996dsPPtrjC_eR1KkJ59dmfP9eldrfeC9tFilHTdxMZeWFGWbbWfRXwu7We3rxNUFT6Aw2AvHUJ_oy6XVsFAVKkqQaiyv7fk4XFC9PLobPageg9JDQYREImY.Kb2cP61LX.A6c5QSNF3I0LB6Fu4IlQzEv32ujf7vgTynbWapuph414ae06DAYs4qJQbbOTeoUD6To4RsG9SAqHbZKsMTvxUjLeCzcVu_p97KrcETJP6jXOFdA_Fl5mwtJympyQvHS4P0HO4vJp_05L5ib8gul4PeybIQzPWkoiUQcv7R7FQP6Xr4tiVIvnts1sAaZ5lW5RwkzjptbIhCwo561q0izsZyNmD2exIiwCLLX9vsK5mVdszRKBsnOmCsr6T6NjHZMQIYJfI7o4ZjItDJW79Mpt1D.4LgzA7w3dhP9IBEwUCFgYhUhL9BwQtkSatyBUffF4xztKGVGNVd06mHCP5vyliiPvBzM.3vchWDFieAGTIql.BMLHXa.iNYwCYRIHUgiNSFw9le6lYWbj3On9_u1JJhxRTzGkEkBktdkJaODWc9xjUB2vhE6fUJJk3yd99lptdZw_XLVzmC.58r9sLx_kYJcGquGfmklgMw3EL6YE3gBZv4mgnpp9cXUUXZzd1CYNp9UcqOPt3IKrt.b9OZ38b6r3oa4EPiVWGK8v5JhirBMb51BQos_zkKrrdIst_eyQJGegNN_hUDOLl5FQraULsTUR9gG59fmmLhemvzvIVEZPae9SxcE5QSuha6mdySDaZ7bsqNrhzle3N2R3FaKnvYu5q3XoF53KwLf5Z14p_kev4M7SSIVc_zrd7Lt6cLgpDinK1PHV0w5BgsPmm.NVJm_ONXQ81BjAwLs.QA0NMzK3Tm_qT_KBZHLVedb9m7fCcH5F0Tra45RuaUMvo8oqNZYv66zYMM.xtPBczhn94d5mGLkyZsuE0TNMbHmL5gfpx3LzuDtR75MElzdgPBeeIS2u6UZOPT1_.vVjtQkpK_1dXYNW7iiKozBYFp7Trwr6h.OVhzSUeEL6wkVqSG6dw0NueIHhwggb1S_dWSP.lwgt58xg_2FTKr6jua_ttvY3LqaEepE9Pi8gY._0mSZgLeC1Cnunc7M5TdVhzvw031h6kON_7QJwGrH6SBSz2KxWQfESO6aEkSqTuXhLYLLBJZHurJdTg5zksv8XYDg8DBYeP4qvFwmvImiDUyWlSGXZyUWUJnBU3IUtzwoa2yT7vOsuYYB6M4PrX.jZbe8JaDwmBgn6v7jlX7sbj5r6XM_vgNywVAGPUMF.uyiobk1e9kFLsruR9rf0jSyMkLW5BqpkdqcFFDBXi7Tg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d7500dcee0fe01';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, "\/1423.35112?__cf_chl_rt_tk=dw4Ap0KGZoRWY0XmlPQoJHXCPvaLqPHUHnv1Yo9D0Og-1744173483-1.0.1.1-tc_ZakmU5yyuRxVXVxqD1z45O27ZTrMf8fygHwfreFU" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>