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: '92e5ec7f0e58cdfe',cH: 'n3_r43E6E6v_sdSdUsl63abZ0qDgggnF9SAtNcm8Ue4-1744326691-1.2.1.1-bgR4JfLH8fBsY4lBtCcWR4nnxeseIOK2PA9SSG_HVxaoXxjzqTyrjJWEfE8Xl1ps',cUPMDTk: "\/?q=in%3A222660&__cf_chl_tk=53bxPQKuORlL8gGMKjmL68gsElOLmd13KaTIb3lHV9U-1744326691-1.0.1.1-UpaGxHgp1bbzhYklRFEN5LDZGlSLj61OSA5Hu75YsE4",cFPWv: 'b',cITimeS: '1744326691',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/?q=in%3A222660&__cf_chl_f_tk=53bxPQKuORlL8gGMKjmL68gsElOLmd13KaTIb3lHV9U-1744326691-1.0.1.1-UpaGxHgp1bbzhYklRFEN5LDZGlSLj61OSA5Hu75YsE4",md: "5CLyrSvxu7N.Nryf.u05UFra.mGYJMLh9omaPCG0Ee0-1744326691-1.2.1.1-QDlPIe2arLn7.5H_1xjvq1swdhkcrB6TjP5oZTuLq0MYFg3emQ0tZByqM9QAJwma5vTx_vLcIDBZ48nRK8.aHVx8qegQK1WHC9PujUHBIrj6RDbdSjDtqDqdl8xik4LGe4dbfcIfEcdihvA.s6QFyG3zEJQQXYiM16BI5oy_lIzMDqViVU2cb0TXe9gZYrRGBeimlhm.UUV5ptPFbZezmQT7CjO_e0xyWmHL_.OFpvfMtmQfdlr4GnJmtM_r79G_FLNrMwAx7ftfNO0OeisoNNiwjuSqxGLJOGMr6JnNsh9PHMLSp9z7F7Jb4fk9u4FjQ6lhNa2vii72N8lVAfRc7ScxkpC6INpxgJ7ZtD7HGF.jrMMezOIJubKFy4JzP.Qi6tTFtoTn92hS931ivU27Zhmv6p7vXAKs6YeDTRXaW3oY4DA9iDVGf3PqdDjEPoxQa.zugEBU_uLCpvFXwq9rpF5ZelSscsK4XVn.hgcnURkYiYgkDOg0iirxWyyuVKopzqNgQ7H0nMUCSt1ISA5vzbYQXJk06maTGRYLuISSN9lzFkzU.oQmWn0z0qdkR6pk2hK6TilrtfupyfBwKi1cQa0DObRRePk96CvxejKTxbo9Ey07F6vKWqV7w3q1TRU5XCz6GHXcPg064Bplyjr7jDQHoLw0kQWhu5JsNgSDBK7xLBl62v1qnq80GSJwVm7kyhUf8mLNyghhYvNnxWKoGdowHH_gb7m4jKNs4q1qlkJetgu98Mo1wuxmwD40VRWSu4aTOkiaUrGvm0Ei6inwnGS4XNdWV3ACpsrRQXm2w7cXYDTl7m6YB77oHX.UcHqSza37lw32jsSp.9V24PRU.GCv4GOXK40xLtCrQqw6a3Sg0jxXon.7.xnm4jc4.EzwIoAV_Lg8yNqRkoKS0lazU5Ebbn1ece0lzvPwF2a5F0mMjPRPyOVT4RC6W16Z_S4scx7xyBqvjIgOHokocG2e07V8xOYrMLo42MuK6yWyQzSyY4rEOIK6630BaL87DpEhk.TuxpwGdyRsnBNLLUTPz0jrle7pW0Bcvf35mDr4C8jETAibmy8lejNTD4SAkrlegxEr0eqiFCw1F25iK9GF2LPvpIt94OCUcqgMdSjrCm2yEifF4BanLMXMKkjNGwNQJ8dvQJxe2.7qr0m0nS.8a6E_8jf2ZLqg4nx7wAXQVJQz.vBznlmjNLYUVsc932Ld",mdrd: "WzcUPuWUWXaEn0dL29hvO2fe_qZWprk7icyszU1rMYM-1744326691-1.2.1.1-5FUSo43AH8fUJcaBQJJpgkZvG_2B9SvNvo0ZdL1WNpBQYUbdTwPUyKD7eLhjLpThauB.PwJk0c8R_HRddbH73K.qoYonFPR_AUtsLwyYHt44izpBF8RGbUKbRvaIqqMQELAoLItm9XTyTDm6no9SYjZXq.Zm2glBrOz5HSWqZvV8_POnWOJO0ja0rnXaEerUXUFJaHWiEvxDuf8498z3NNUs_dS8fMrKeTQcDqezcUo0yJLqMv.Aii1E7k_klU8uqS.En2TiYxHK2YEIPJxqmtb4XdSlz_MS8frw8nNJZ6.eu1JBO8_lbK8YcHQchw4K69atcXSDyp.3BYC_t57YhEcNyq9TihI5_kcDp1B_OMomh..vHNVFXIKG7Os3anBau3gGUOR8M4uWC1UNxtoAJkvJ7sQw.0sIPNF0bneqiSJ_HoFVV0UxtgLlUeIkRTCbCcJLwZ5qpw2HDhAT7OnRuDW71WhrCGporGpJppHS1ZeqA5UK4j_b_LzPBdwzL9gi4DfWumqqghqK6xTu6QoSKRW7TVzHmyAxUhVq2h.bRG0PdsMa62lh9_0ac..eQub4b07h2Gt92HUrMIrCWyUYV3nNoO3tjd_eGyKx41XfrzF0zI8OHgyRZqxEcQdq2uP1uv9njO76hdeykII1SJ1TrYIE13UKpulqWbGpLyCmddYr2pcdQELe_3A.EsfgPm5HObGEKYPzOJXRm5OP76I7wRSlTR9vnxZtNifzUnbMOBPJSYjvzYolCBMJ676ipE9NAfcBH0sQko4akMHoilcMrDGGu6T3iUVRh75461UY6mJuPTZKuNzqVH2VNHL.sku_Gfeyb4u3ewzJW0xT4RH3YzkY8YjSkC5cJZxsNyTH8BgHDwJmfua.DcslaULFnRFuxqe38qJMH347TUYV2q50zitql8h7QTd7p87E5nW7qZGBu6QtJeEjP5hsZWRxZi2dfXZzeIc0TPmQN9Pp76XJUdHnBdhZO5GPIa.YPFSCc4DnJTRsyhzdmuy_nj1SAx8Z5ttvItZ6IzySavXeIt250OJXBz6bwdrRJFXhSA0RCTb5cGHbw6QFh6CUoltu3KDXeg9hTCQmrVu7DdeFkVEzFIB6X2McfwMVL7UEjYfCAe7BLq0KRbBkEu4wzARtOpmgdD.YMHliKxrPd0sqn1Kt8aVZbiuQY1OWNvMkW9un81_TZseuxw9S.C.ysnGqvueCM9_cEVJlUd9MgL.mhoIsvfUQXo0C9ZcweNjHmbG0zlyxwUUL2yykKMtfBZlHTdfdLYaOhf5hA4Sl6J0f1HvFKGZZybCHdNvm99SdIfdUVUQtvPwygu8En.Uu0nUjiecSqIV4ive2F_DMarnBdtIS4LKY_0feNNNV0IiB4tgLDJvFDXk6cf_dirOgNiU8YqQcsdehKodmzCK6iPzSH5evgCG7SR.cIonc9V1Mb8Mq3B6pZPOia6H2lqSYA4H2LCZk4VmrvbqeH9m6a_mFh3wWEeOWpIZmDtCYeuqiMuYTC4MTC1PqbGPOgf_n8Fy_.HsnTy8Y7tChD4Dhzx9K_mhoHZF1N0fiyqmEmL7IVWsTQkae3hOi30iWT3sNBxpchf7lNpC7CejkugLqWPnF2GCXEAI2gZFHZuOgNTRoKuFNZQ_GclzbCRnHxafcpl9NXFIHwJBu532jjFEVuWfotg.WZgLaOZGUPihiek7aS4IayuMuc53nBporgPouL8ui.Qgay0o87Ss3Fjmk3lmtRSB3gxq79PSKG4Pa5Hr6MBajs62W6lEZDxX2ox1xPZlqQaKRd5Qzn38R6wBU6lPTZQ79uJJZC6aomp0F5l8AvNHGVIC9uuaZtLmFfhquvdYFdCk.HTcTjUpQwgaLM9gDWMCyxj7KwVPAfFZmvfRrNKPLKKDTwZbSb.UZ9CF1BuxC5cAfLdFMNQ5j2By.Z8wk15fsVAYd0oTkHCcWcmL4bZj.23i2AM4ExKagsd1IGnyocbYVVn3IQlYzhZ24.fetKYprUFoCFUQBSUF_K9ZzEv_yoiEtVtVVkWpxvquVh1GVphVHroYnE2s3jTx5iaIsPmjbHg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92e5ec7f0e58cdfe';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, "\/?q=in%3A222660&__cf_chl_rt_tk=53bxPQKuORlL8gGMKjmL68gsElOLmd13KaTIb3lHV9U-1744326691-1.0.1.1-UpaGxHgp1bbzhYklRFEN5LDZGlSLj61OSA5Hu75YsE4" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>