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: '92d82155e9525f5d',cH: '37QxYQbf633fdAstK_TJKIQADTt4x9aQzupGYH2Lmp0-1744182055-1.2.1.1-RbkTbJMfPiYeIx1SH_L4R3Eznbxa2wJd1YVexyIhsgA.ZjiUmmUxx6aS8.nXL_km',cUPMDTk: "\/0276.60013?__cf_chl_tk=gm3KPjzRZp99_wFgQuAzWErnpwvInZ8S_Y7TEru12DY-1744182055-1.0.1.1-FHpzpMPBuRUlNMkbp12yugWcc3wEYRSJGCKkSiYLyac",cFPWv: 'g',cITimeS: '1744182055',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/0276.60013?__cf_chl_f_tk=gm3KPjzRZp99_wFgQuAzWErnpwvInZ8S_Y7TEru12DY-1744182055-1.0.1.1-FHpzpMPBuRUlNMkbp12yugWcc3wEYRSJGCKkSiYLyac",md: "s12ZJ4D4AIbkOa1.ZIaSiJAApdAyFIZWzGoIlAFA0LE-1744182055-1.2.1.1-ZwBZsigcCJawH46dTICenk6HgWg2NEP8jAB.24QcagEojAYh_qszS4f4VMlz5gZKj1qs2DM03RAhfa4QOpl501KWaUMxUhtYhNbTIP9IQmEo1QHSYtwubRx1JhaG._d.D3VzJaWwOvTf2MvXvG3Xz2uGAWvEyWiMx0u6lcSCyfbiZjPOoGbABCbR9LiiiAlM1YvvbOExuagqDi7DelvIdj9RVEcESYH9ZLCxaVny2gAFF.g5PMLbEtjbSDVheAnqrKMFk6DbbXnISrE1X45J7jXkb8uS7ExngMkIG26pgNh22HulnvYvXLULRQnBdPjXQYd1OGDS3_tTzKINcL_no4ujJaJXK7mmH2uljmlLbKMN6dwHvTsCBc9n0PhnuUQyCvIuiOp7molm2MnyCyvQ5MQGHKh5Lg.lpwpCInxXs1CXj82cQdBQ9RghH0V0jw5aHh8pJoxoNHGovsQztyEBdB7jkUbJTRKeW5m_MGDswBTF_4DLZ_YD0sKyGva5j7bpjHp_T_8t.ieFQWZArvIm1zbWrx4d0fQ_Z9FSW7eAA_VWGbsQgQek26pb2PsjH92b.aUsdGEiWbrJLXqFUeH7iq9nhUPZBWewyVf15DCQdkLeEoba0_LiFpp5QN.RnAcDQcnoxwIqegJwwBAgNoH1xq.o9W2EGPJZQbzjvMp3Sof.S9.oyfBrWx90ram_krWubvSpH44J9HpMvHz287KHSPvdP2b_AdBIOJ7w_abYAHb2oRXy5VCRiYxOs5FbEv.FAVdwlxsea6KegSOpt19fftneRSCticFzVJc0pT.zivZ_edizDBW8lzbexT53e5cTG1hmCSEPLDThoVJ1U25_ZtZtWJPw1pm49oZ5BhrEYmjSZUbaGsxZaC.UcP.yJxWe1hViRJm1I3x3CdthiuM4OhXRdwFmb_DUSv3kYVD_2Z.CMQLkeMoe.t9B2yVuFT_lOj2Hp6FhZvM3wHykB231ktwX7EKhjxOQHrHy3BTZ5kGW0n3UhG7B5gPtkY9NYGPSw3WNpkCjxDCsvc7pdwJfAVonknyaTpsRM5bAr3myobrq3Py7ijIC1cZ3D27.Dh6g3T5osboJj_2tEC.BQTrI38rpntgcNXQH0hPq4Cue82zfzMzbSSrIdqxBvv9O56xASmEEDxFuBRBmk_1Am4b_NUoehDrsLrkKLxY_P1MA0ISTSXj.fvqsrnjIK.pZJPGT",mdrd: "pEh_aueRfAAMZmxCA8hFzS5XjqVPxbTjTMAvvZia3Kw-1744182055-1.2.1.1-4hxRpmMo5OoKmWZfRzVjh.e.W.7gyXcuUlPQlye8zjAOWlEY5dzzuU1zzlCFd6LvGzDCHZSuxjl2SXsWjSbuZpOxffMb3nuwMwtHt5JD2lGpx9ADThZU2SLgr7jt8OodhQ9ypoqXXhrlaPfv5KVdDMT7DW9SVdYN7Bg5eDVRUO0k6kQmEAiMC0c5oxnZE5Ds2wqHtqAOb9zxNUm6tybCr8mAsK2taIOvEFK_QTwnyYRgcs2tloQysX36el4xnLZDONd9E3LTLFiqzuq4R.qkA8Ftp5a_m07jA5egtkGLMzUJENfeDYaiwkj4COzdQy1odAoNhZeqvpA8OlWxWZg7udybaPDhcLlb24bql7nmdYl9SAi2pDNK527nEnZb9FWkEodsQAG8rueNr.JKZ82VRU6nwp6XqrPl55rIuSJ1VUXth6lBN0CcdrRkjq89uhdPDaAOS8LLj237rEl4EgbIPRmTFIP2Keoo37A7RwTsAe3ocVALbkUOFzU9UXo8CLWur_qpe9.p8Nh5_Wrm8rN6OFc_VxZjUk9Ec3wt8TY6nHjdSKTPGRsJ4RUlw.Yf913CTOKxJDzpCwRgqxdErQwI94yzyR2izpx_vfJXDOMbecjTUw.X_VrPeMILg12H.8vlSW5.JoWwpIS6Je8lmKbLTrmfdLMkO7yqZJOJ67W5nO0tAJK_nFMpYftkdYP5cfiXe9kfxVKQ8gs66UbBl17Xvuf4397BD2cozEeHv1GPqJ7u3b66SlPK7SjCyCvg53wP9T5QExAJ1kudfK6JcyQtKR5gblA_3XIB5dupvj3DjydCFT2_j4WhiLbCfpUrIgYMBNpiefc4vimAFJy18E_Axy6GVtujt.CoKs4yh7G5qIozuorxSGjjAzmcmwfFPrKg5uVJiuEYQY_1XwYhgH_r_S4BaMHc0LhbW9h6acoWf1PvT_cUBBR7fotepWRfRAmEyST7_DKU5KNUNCoNVzDKlQ9Rcz910UUUqw6T6PpX30AaID78NjfATe0SHUUzZH9KKbtDp9styfHW2g3QHgesi8oHGSNfnr7K1oT9seO.ii8OGtCZw8Vi3lKYlZ2r_1AvwuTELW5f6GGgjMtyPBTunKYHhb0H2cTbFsBo71vJVJMDzdlmDg8ZBau3fV.T31MXrBZdR9eHmNx6OKkcctnIqieoSci8D9lm1JTInPWFs2.2j6KyyYrGEBA7gDT6JirS1Mnf7vMcsGOeQRJgms4ejx8AKsZ6FXnem4SQ4pa76iQBZHl7HMapf_5IKLeGiJSBCbA1LpkDU7TtPIoDFUn5rlHEyNH5n8wetFbPsn6Gk5tkQPuIrD6Q6pxX0xFho1wClXoP3PB9pPBv9zuMS4D_SXfUcNm2SWuZSleSQHKS8NUFkFqyyTQ7jaycfyl26OSXjYksOcbEmFsxk7ZBaxBJY87celHe4MdLQ10rZ93hBBBNW7tU.4yb.EcARRIkHP3qu2JYE5tZGv1UTfJ.OwgZlMJmxht.Ykit.r3Ml1z4Oyy8j7VHg0SbCASkEcmm0P3DmJSCj6xoxNg3CuRQ2u_gTRgavNPXPaIJyA9lREsQG0tKYdV9mLYmGCQlJ2Lsg6XJsHuHvo6m3LhOB1dUFxE44nzecZ_v86WFxiSPKT61bcG7i58c3x1l3u7PBxNbuZR9quVcwXehw4ayYjzRCDqLBQw60LNv6aPkYueAK_nLp8TLiom0RLrbhsdq2Qyw_WGVFwJwshXOjwGN2qXXDx_Tz6C3Jkn9grXQiOoHrz7r73RjMpwg32zvGXI3783V6DpIR5PdyqWaKN0JnMFmJno7ZLzN7Rgr04ilrVBUIVpj_0Dv6rvnD6KeTe9WyJzt_YLVaLxSvhHz6wErKYm1doxJBf0d1j0VQG4OgDtSRnRY1Hu0TTD2Od_vZJnJwm66trlTZouaw03xcrthD8UTD2gxWNKJsV7BvvzxCUG7YuINYafsbjMZa64Ti.B8PwOl2uhuzzSTulUVT6ZBK992eIDUE3AVqBqzv8mV0MQhYsRBo5iZAGf0bPgvJSi4VU.fzVLH"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d82155e9525f5d';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, "\/0276.60013?__cf_chl_rt_tk=gm3KPjzRZp99_wFgQuAzWErnpwvInZ8S_Y7TEru12DY-1744182055-1.0.1.1-FHpzpMPBuRUlNMkbp12yugWcc3wEYRSJGCKkSiYLyac" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>