CINXE.COM

<!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: '92dbdc83eb14fcea',cH: 'g9ZIcjQEUkyGKSRinyf8JuUM9F8dQDUFb1fFTkTDNiE-1744221179-1.2.1.1-05DU1JY9FVO.LGwncBkMCfFKn.GPy7HNQ1YRLumqwgRz_pH5oWph5UKXZxmbULKz',cUPMDTk: "\/serials\/381?__cf_chl_tk=s2sO6q7WlM34nvFKIfVZADcR9weo0i1e15gNDhupxu0-1744221179-1.0.1.1-fHD0Z4F30knmo0hOwZaJXJ9lqtfWnVacmg10157AtDc",cFPWv: 'g',cITimeS: '1744221179',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/serials\/381?__cf_chl_f_tk=s2sO6q7WlM34nvFKIfVZADcR9weo0i1e15gNDhupxu0-1744221179-1.0.1.1-fHD0Z4F30knmo0hOwZaJXJ9lqtfWnVacmg10157AtDc",md: "Jj.VXoqENpeNoB_1ScLKX9KC_nx02zBjIky85Y4aIxE-1744221179-1.2.1.1-wF7m7tzfaOiK1nAENURPUvaog4ta38ok9rPQe61kYxPsLW6mWpMhJC517m8u_XpFtVvCljitehYWQGSsmhr.bm0U27YG2tU.88zkUfwehM_aUU143Ui8baGoBcnkFvDs6MhPvbzX_ZNIGa6pbK3V_oLcKJAqAaKvrFJSGYXAh_Gv6BxJG8AE.1FY2X1Nc0r2H3uVpSWzqpD4fqtyaC2SILoWv7MczmX1ZG8hQhhvbksph9_YLKEvXMDRr.awhiI0fqEVhdLn6ZplQn5S4EolvWoobeCYwu_VJOAmODLSVHBg27nL7iSYRZWRKmV1yfXOtIIVW.aY3w3EAK9xNRLgZXVBMlWoX0F.0z5oxXlBUAXSiLozO6uY.qK1eLafsqrNeDNK1c546hlWjCOZtcWphAsRuEgE2XgbNjx9g_MQBcbuXEpKirSzIipkafUr.R78lcTcz1A9hmslmkePYcJMGjLZs45A.HtVa7U0FRh7QTmmkNIQb.Q1YgsGBpksD3nb0O5hOPzvZ4cMsl5d1V3CZBCgpetpsnOqOebJ6hEmT3I9.naSYrOQ1P6fdFvOwiMShlrRe8r5WK8dBtDqBbcA8plqbooQR5I_3sFKITd8D3yfdbiDg7Y4zyq8MRoevgDs3M_iada4NOtVLLkJPLxmzpdqR2U3Cidegbz9Bx6FVFiUFJ0o2zG1zpg8BmKvmv57SuBHgvISGBsY4yl24YZtORF90G44VNwHB70DLmzP_JQ.Cbrqmc5os8HRczJLu9Nuec_szVv0RlXguMOL2sYzmyd44RamblIStsHJdutDT58NxwMTDdeG8gff_795K4aqSSDeeeHHIxdNR24tXUTYZSeFhJ56N..6BrQWVXL1HZiwUOWe08jQcfk8qfpRJ0LMSIIpS5.T24zWxM_phDfcmqSfoYiY.MTLc1uq0SY_ssMufHZLAESG7LYZldhuHjntIKPDtlhyznijgPgWE_W8ncjNORJVLnKcS2gi9sBjS_vPy9rdqdu9D0D41DSR_S8hCuWmihiOksyxGqmsAqxyIBqrUHYlFNVhmrWXwgEg9r9PcDOufaOD32_GfFnAqS0FNj9SIBpcS7zSwL0Hl.vfmhuzz4lZBNharskztuMzvUuZM4jOSAQWGu65FPmxWdEu3IdpNlLhB5rC_yHkuA9KnqxOWZhjAqmoj3X3vE6T9uhd7iFkHgCmYhmdOqLZ2ZG1",mdrd: "7Z0OuIGxwQRSlYVHufddUdNLpSfMfMAYhPA2_U4f.b0-1744221179-1.2.1.1-hms8tUHeGIQ.DSXdIL9ZTpsllu469FZOnFsU8CwOrozOCXKmauQkK4ExEuF4o3FZUtfywpqOH3CRdg4Okge_2WeaWUkjH6nWBbjW4fpw9oyyq8Y20_PeO5qp1zpvQAvPduC0SLPnH9Qi3eklbmy.VcHoARcOosXZ5GFNw3vu7iiD2XjtjMDbuSY85jpDXkWVtHyNyMekeSYvk1AojHyaqaJZTyOuvqq700bN3_fEXMx_KNxApYq4mmVhFs4PSjB8CBo2XYeC2OG3HCL9P5Je7EjVxq2iWjl1eu_g5N9XlyO7YjTmx4CdEUMWSNeqwoggtgnguMZS5yWHU9M5kM4sCyCkdYflyVsRKZhRoSumNPsHJ3_B36lM7TP2ekvPGIehn83rdUFoosTHLRh7ubpNRkXpoWklH1mQMjEt2zOxGe75mDmC8skrduSq2mGOtpbunMJJQu8hBemnX1iD4cJX7FIEErhO7LTX_NitCXy7th3B5jNvWx_1KleqC7fFPophFzAJrxbDn69e1lLf7KyrfPAVFOhHbOSgdF3PkzkZ27UGX_a9ph.AtIVJDEG54d28J1Be6poSTd34X_58diX7BeinbnB6u3XF3UDCsXnVDt3akRA0pnXT1xteE2qanfbm3UkmksawgnjSA_2jaYjzu6XMgVCOaQRVwdWhjunr23LHWHtwnXhctF9nMZAA2hD7.h08yOxsVLBEOp0hOkiGMIqU3DfEjSsg4_xN.7oAEhGNZjxoydCd5RaIsfPpYTib_IXuvXty00uoC1VOajebnAYVI9NTVxyJkra1WYPOlTTGlIAC2PzLkLSoKzM9bSl2irpZ3CaoI8mu58vX6Xb_LUNhUcQbPQEjFr_mX2hx5gpb6bxyKfExG8tW__hJHQkG.mQ6RjqDUMry.vVe26SbgDrEPIl43.hSqGQ0SJQjVE.EceGjXwyUY9S5mpZpJ9YLYn3IB3l6JgKJsC4gF2n2PUaHUNceu7RDJ.rP45eNqQo1jElPp6EoXcPlQWTZYv.ekWP1ig36bQT4tdowkyI43UyPyMAG0n34.rWFIwy7nkNVRrglgRQnb5uRR5WM0bR8yc_pBAgaOtpUKC5KEA9symOfHv9X_jAcfrhsh2XwGTlXRoFwAwvwCjzxioxaiYnWJ1vybzUzN_x5ymmnJOoCTeQL2BWz7ayMMgqOlqsTWa28rP2Vw_mG1_HlahcE0a9L78_E0VbudwvBgl2Zmxke8ny30rPMm2ZNhmKWMWludoRdySfFwIikAy2FQLimKgI1KZ0onANMqaeg6CNV4sPf_FMEvjhOPSyBCVsrSZKP6b0rUVzSG6FSVzoju0MkZGzRLBsbuJiLyl32mJN2hYR_pwNa5wmj1IFATbPV7IMSneXuouQe2LqoL_U1GdegQybslhmfhC11g.8x5.2VH.ZBA5lZUyCsqBsM0QbTS.v7Crhm2fWkpeIxXkme662hIUDRJLybv6d0wwnG_xEPrS.NiyW7B7hmfC3tAYFPTjA2GhwAHbS7sLa7qmUybEhbFELa.ihxfeQ4eZQQm6DGND8n8llFkSeypb0ntlJiUOV62T4thS9elSxTWS3Crn.AdLJERlolBqokjIkMmfBWU8CWUK8T1OXlqZVsUrcwttrLO_MHxBm88a7GdJ8nel5BxJRAG.iRR49m_yOwCISLArhM1R1PrI5dFWghpmqzgCaW1IQfxI89zckVWVCwl1xAhUJryBMecMtsPvJdgMKKdz98FsYJTvIOUIxsfBemGtK8LXG05kXqIUa320hH9JYoeFsTsmUob0OTC9v7cx24iR.6OPxqqCW7Dz5E0kV_H10s7LUg81QF38kQeS_o1Wzo1XTm3FtpE7T6GrTegu2NaEWnVceLR6E8EnecntyFCXBKeH3hOCox8HSMw1cA2mcy69kYJ6TySCq.oGHzgZUoBl7d6sbtke7G8nTJRiTZqYDKXWblLICiSBGERVApZO_EzapfNls7VxBapV9RUhiXZ0rrlqkuaSwwr4zssubTFp9IsOa034B_xOSlnHmcmYmbcxW7EtJdcI04LBrQK0jkLGrT0Q"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92dbdc83eb14fcea';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, "\/serials\/381?__cf_chl_rt_tk=s2sO6q7WlM34nvFKIfVZADcR9weo0i1e15gNDhupxu0-1744221179-1.0.1.1-fHD0Z4F30knmo0hOwZaJXJ9lqtfWnVacmg10157AtDc" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>