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: '92d7c8c8fb63fdb8',cH: '.F9eOjZyhiAXR3Gamr_RVDcgVbzJAhF5jJfQVrY8aJU-1744178428-1.2.1.1-k5XjVatcQ4AKBTadoMFYFBQjhNgZaU.G1SharEAPdr.afI9YUpX7_D9wdnB8MYwf',cUPMDTk: "\/1341.47078?__cf_chl_tk=U9BVxhrsQUwni8zxgh.7prIYRicAUwbyjQDgFs.Ef7k-1744178428-1.0.1.1-UR3Bx_8CreqdtuT9xH.kuVnw2KfKk2.rtkYO6dJv5r8",cFPWv: 'g',cITimeS: '1744178428',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1341.47078?__cf_chl_f_tk=U9BVxhrsQUwni8zxgh.7prIYRicAUwbyjQDgFs.Ef7k-1744178428-1.0.1.1-UR3Bx_8CreqdtuT9xH.kuVnw2KfKk2.rtkYO6dJv5r8",md: "lzUny6bNvLC_shFHv6s3mWJt5xoSjZjU9YbbbQiMB8A-1744178428-1.2.1.1-aIpnlhmXbPENNUXRkbZjUn7MtrXhXyOKba5iQ51dHAEcP9Q3mSIEDKiHYc2BjL0Gz1XAjTOzTCxIuRFL9znT3xOuNn8gNlGHr4Ptq2oe12uPEGj4i.k74H_Sq16CovdXgMt7665JbXn8soairRGX1EtxU8Q4UX_wZ0CjFBUXc5fXsGRqQk6t6Q2HUGbmpnDAe6JdG9xJvZ8iO5otTrSxjptNW4M0tYlt3MiBcXOd8DjhwMWIB8qYSgumAznb8XdzHgGCuU3vMikd_sALcIbplHNasdPFR8LienLBVG.2QaL8gHcUdftgQFO9pY6aFzle59nPU8tSbbtsB1e4OgDIdoFVjKFUxmhQeJV4r0C77YZFyS7srmZklZ0ExpAn5WZUw.5ezDyNuJDkhOFDSPL4e7gggn5PuJ.osMPIYWBVV2MeyuX7u29znyJdiP3.5qRxMJYfS89kyOVBfVj2zmEdV3B2sBNJN1RDcZXp9tK5ZFxkpdajy8fCVwHWypzfJOVvqKpZ4slwuYcw6L_cRGtca2TEJ23v5Fs73z.1GPmTA5TMYXjuMiXJAMKHtDi994m1IBoG9IzFZA5xrC5ZEHEspXxj2MHkRE75RXqjZ5.OQD6hmVGiERGoVcjf1yF1g4AIfecNd0waVgfcWmJyIcZODI2kX7URsQj9EtS7ROelbsjVxRIc3asJPH3a1tdxpj1.moehgSb4hKJRh5UvU_7uufS_clqxnbDKzKHgDdsGZ.3N0r266q8eWsc1KbSATEK480E5B8VrXYWXk2RJyL8bKF8oBIKBj.pQOGHnz5NhEmb6jlsGKbSdxZU2..cm6R560Yr2N4KkbmkWP1TEBafNdfCjE9ZVY8hX6AcnEsTBc7z7tdJgqoBIDUgK7cPqGC.3s5lTu9ilsBqAwAGZchv0tBEi63HFDLZ8SeXel_UjFYAi3VwO8DLQ7fwO.yVb3Z9ZEOy4HBdwqhpN6Q5xm_Wq49vuWLgZ0XJc8djaMA0YxwKXHdGTREiA3ju13JDozcobhRya0t05oPIycMHBL.uXnuQySUAxGtT7cQdz8yU1Ou3MBNrmFCkerTwoAgQ6n0r38HlPJ9rEdveHUyfUsAXvKYAzOEO582X2MOX9FUR0hJMAQK9Da.omraBYoGhIugCmlh8V_qJ8_tDcJ_YkB0av7.Rtc8Rx8IGWbYRAAjAUxo59nQpnanCV7zWcqU56lAyN",mdrd: "hk5DBV4XABkzKEerCXKSA04Vq5m8l2gWOPUXzbHtkyM-1744178428-1.2.1.1-UYfL.JhzxATm26pjPkPQTJyhhFqeBPkXJF3yfG3LEe6LgTSM64ElCWdj7KD5zRxkVjOjTEAKgT09Vysbh9Dv_oaEhfXVZGAPk7beGUOHz3TgULZ19A9zxa82VeDGy1VR4rF.uG54q2sObLp6rT0M9YKDvkemFkFe.VeLBLiIUrs4UkHECeGoF93s55CC7lkj2.N.6UvqzhVRkmTDsPChYnaTKaLjcTDWE.lWfBtqH7E8wnTGwDq27xzO.6Jvq9ljMDuY8IHCW1egQJHkNWZ457_VMUyJjd8HADDeVdyyAGWGUt9U6pjVI5a8pcZiPWVZsEq9TSI4iFHoGOJFOKsYujuVzegah7ERhDOZrls6fSeSKIzFlzR5Hk_OUxayw00nJqPN59pPraKh2tSzmACOFPQQrWk_n.sLTgn_CoYe_GndmA0V5v1V4rqnnQd_eqImvQo6VInSw586bI5ZC4NuQm_iToLmTz9iz8Nx8h1k0ekKW_6AMNT8qlr8o9vn5zMH81odD4NQdBcT7q4nV49VR_N2zXfD9wY1PpPdmnHo_TRILQtFRHCdbE6.NCi4E8BDo.wHDQSXomssTg_5UdvATpnwl0i5kWnFz5qA1z23eoMsVYFuF5RmJdpqJml9vprS0MDJC3uycwSPxhKPrn9pZkk7ypBPiBpW55Yk1_8uGMQy3MObe7HEy9B0qXKh70ZPf7htTg41ZUFC.7UA5UY17oAbX4ctRht2Mch1WTVrsplp_3_rAoJ4utio4iuJ3YadVZpmZH1TVBp8jRmxhWp6qfaOoNyZrH_S6JuYYBxkxlNUjAKCyVSdG0Vds57pBNMZU26tqnOz30E0NyICrze_e6zSkZYstv5OqvdQuwt.91Woq8G7fAqfr.C19A33hPDQ9JUhBir5gTLcS_hV.1g7vfzP.Gzx8BoSKZIn61jTAYSBZXWcx47.2I.2aO1jRP9ujGNjl8D49IeIYP_cqJQEoWV2uXvErDWX3.wGk8tJ7Jsj1fmaFiJdCGkU6QfqyqlrH7HRqDkPgKk9ko.AQVfWcx6a3To3TEP3jQuItqnYIyjrO.9E_aARAdcsr9xwN_EEzmOLTKxWSOnIS2JO1pR_Kr6vgYzhUVz_9c4AELrxlEgBIGhnM5ZyeF57BqWlvR80CPPD6NsL6101MCVCucJfU5pXfeBSK6QrtlVXYxx6ga0puLSezh6wBq3j2LDc6DmDu7XQP3p1OeohoFc_YxEOVTfqdPkGC5IzrLnX4DnEKmrVpY87yKzJB_8PwI1ucMXdYBX.Qi59iO8pTlsobi.dsaC06sYnXGpwxvERs8NQamfPYIlBhZ1m.SnZ7QhD2_JIPj2qGZAzfuiMFha7.cdViQJB_g7LnIc3RLJmvxTMyon6zTWdaOzMWeTl5Cb8WfjnnCJGqCYPujByOBgChuA1MN768KqGC8LguKwNYiX3LgChoHHDUZiqiTAWX.8R_TDP2h5SFr6SoBRDKylzPAl2h6vmo7rvCKKSGpzSS2sBz4FOnKRBy2lnzgtLlhBBavZBGLvEDkFpLt.BDf_5r6xEXymlLyoBWj_r_0PV1grbzAnZWiqeALlDJ5xk2rcvQG7Ppe80viBSxMDtB7RbaCTUyUZJjTJibUighXTa758rwOX.T69PccG7FpXYkJlWX4BP3lnLB.nKEFTyNs4V7vumTGfw5bPiDCRBDNFdtg3MIOBzrM1xSZ5zwAR3suuWEIyzvbR7eoM_oA6Pk2oKxfSjR6b5v2DXLqIwOutuyd4cIPdlthsyHE1HmfZDjcoZ0SdYpRauwvrCeVI2I.8JI3zC1S8fwGHlS8b3tz_bfTks2lcGDFEvL8JkYE5y97.GIlruTOdcQ91VtcCq5QXEn96UTG8e1ZfW7kR86mYc_i6YA9ioeIbDbLGjYN2BfvVC47g.wplW0.ziBXlsoTjxvJ2SSy3231QnlZR7XbWbNj7YuMKurEPSJTpm6wTfNiN1yCUYl_dvIDCsiwuTgmpN1wDct3xMq9vADJyh8QmOUQ8EQICVwU32AYn7107t8NtaVCyvY7c9OyDgR6cS.ijVUvriuw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d7c8c8fb63fdb8';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, "\/1341.47078?__cf_chl_rt_tk=U9BVxhrsQUwni8zxgh.7prIYRicAUwbyjQDgFs.Ef7k-1744178428-1.0.1.1-UR3Bx_8CreqdtuT9xH.kuVnw2KfKk2.rtkYO6dJv5r8" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>