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: '92e476e38fd79d02',cH: 'QbEh_FwZ_mFYJaI5kMThQut0kOp3NeyPRLtfb3M0Bks-1744311388-1.2.1.1-eyhTVDR31jvYpfT21aI2styRIQfeIVa24PzGCY9nqmb.950SUYn20NusXVKTbdKP',cUPMDTk: "\/?q=rf%3A6746011&__cf_chl_tk=Ybat854fe2K5FgTLw61u5.zzv8gl455FvGmy.oL2.J8-1744311388-1.0.1.1-xOK323IKfAs665LmIhJwSO4U3PinBAqkbIB1m0RVHss",cFPWv: 'b',cITimeS: '1744311388',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/?q=rf%3A6746011&__cf_chl_f_tk=Ybat854fe2K5FgTLw61u5.zzv8gl455FvGmy.oL2.J8-1744311388-1.0.1.1-xOK323IKfAs665LmIhJwSO4U3PinBAqkbIB1m0RVHss",md: "O.Z.sNPU74TAwoRcGMI1mKtfMpD9nVR4QTPzSr23q.w-1744311388-1.2.1.1-co0JxtpVAFcjr7i63snggZxHaDDsx0xBcZ7leDkShSolURigyzzxnkqAUQuzCztXHsPnLqIy7y0pfm466MhVoDhVeqiHF8hkc69toD4DNB4CuMgWx0HHo8kcUF68Vqo6H74EM7CBf9EWmGgEJmCBk0TQTN9Mwsnk15A3vqXlFxiGjmAjhrenMgF35zQPGphzEXfyhf2PudWw1Ojdlorshtk59TZxgUNigXht9HFGZ5ZOWbBaIqVBYeYFN5EQxBeMTqYPoPAgglNZZjYa.5V9JVUN_dwgpiloYPaCVfqE3EXxkaXgGfiz81l6ajy8Fwvts_SeFLWN3IjFTeAcey4nm5eNMR9Q0tByGJuSJqfhPDtOY7rqyt77B_BZgdq1IRro4P0DGtcBMrAVXnTW2js2dNpyoSa8Rvy_5dQwGEDwkqVh5AECHlrxKdihra31dFAY_2d6UMRdQdznUArlOKUSVf3KB6DKZ8Trhz7H9IWwXJwOQqXg2A3tLYDyjO1hVxrWqFe5rmg0VevfLWjbL5Sqs1QCO.ugQ_rozKQehaalkH2XCHY3T2uNJtmWf0w_WXbkBqetqCn8KwDMJZC1_.WmipdS19NtvuWMofiTDp7LCKYizv_rlsJ97NHfBxYuO2D9rPR9QatTbhOGZfOAMkNqDvfpCzc_hVr5WILFqUDLZJqLZYlEREFFdXUvglKmRU7.Ef_1eBy8EU4WY7TpwQZiv8WLg5jdOYeH5zhw42XLBC7oFLSF44B4SoenEdS6n2lzMVs5.VYkzvkaxrPYFJPxLYeH27f1hN4F2NuZWA4fZ3JNjjrbLpVLOh3liwGkp5zQmosY2LJ9ywFJBYm8t5Dl7FeN.A9gbQKdZkuovMRE8gkdlbYvrkbl64thbtPT3XFD5_foVUVTu2pDBYDoT_KwTibRLSbzKBr9cOxjaVyBD1V2qEljXz9suuFCuzYjs2i5FY74om7VPRvxvwefTBsb1bU1CbYv44ohaeILx.DrJ_Wiw90T8K5.Xvn6z.oFovvjiFie_Q5rnPYrPL8gXFkKzP1NMlBljqWJZgmQ_yOAegFwbwvr6BmmaRQWj.GO0rJVarnHe7.UkxHJbZFWDgsa0tAVTXBabRCVT9ZbLxpY4JPA6TTSsG2Yr.zsQGbQ8hDPOQ7rolhIlR4zz4l_NgKacYb1u93wWKO9TPkUTR2NEEOniV4ULNklk9sFO4twPuS6",mdrd: "YwvwT4bSCHg6Oyxj8gBm6f8sUL78SrqulgAPYxq6hak-1744311388-1.2.1.1-BXxn5dyjw8KTr0MeFsoQL.e3yRZfcjaZRTLcoFAPuvF79M4v_9LapYL_GDpVFnIb4aM6IamQlyJkLwCFuylVtb0y2F1sbfzKJvUPw7exEjNrOIprC6AzHFxC7L9WtL19jiRH3brn19gSy986Skpee66IjDWDZmho4mrHMjSqrALvjYMTQ1NVTAxW4lVRt2rVSsMLhPEHvdthGZ2gR5BxpDzfgvQtgMLg8HF.PZ51cWUnrbBPIhGr5tTRr6_ePOjZFgdRXGp_H0hv0sLxsXIDyyg6olDto.oLcCI1Ca6xw5fXOR2KmMJf8v8S6iyDrTJnME6cbl5d14hxblZI_NiNSAHLMQmEg3Hz9ZXc2sVloWGJB0RgUo3wlaHKTQ2TeLNr5st_Z7o.GMhfX2ldPcSVfh6tiaIowrpYrAKLEsTVm1fTiyhA7xok1DhSU2uOvf6ii.Kmcza1e2.wM_kMybd8QewJt7nbq2g4Xi3C0HL9Bi_kZ6bbCrCluK6F3Sz6oOvvOk3LWR5lUlc1PoRvJH9.nEz0A9Zb3Tp1_2yxf.zaL4QNCn2EJt64iABoH0xjB9tdXdYCfN7n_0uMZa7B.ikgNz4vtBcWs0uqOL_vs9FfaJT6iG7DIXtLyFKuJwAd0NpuBf7ZLevsk1be_hVXg7IRxFOLja7U54J3ZoqHXXMTHifx7UK4SdaMxwj2VveW3Ru2L0SS6CsQw8C_D23hyPncHjE_bX6YFAxmcHVMn53LDww2GeZycNchM7RC7NJy6UucSZ.iCXjNNGlos_ejQuJW9qXd7ZMADiej7hoqBGOsUCHKw_iJzpM8Hm9AKOujTFbDE1WrP6YgSpPJUMc_e12LgnSJIYQ4km_jL45bsy33b4O1xZpDonvEA37ANLsPnWtDCbLleguYrztLuONh9ANx06yjoYxueHTATZcrul3gNK1nO2FIsaLEs80tGPawtDsdkLhGXHKATXBfRSVgs3xlrWCVEeLnA84gdLEFyteu_U4j2yWLvHBMd1I2pGNtIUoeAd_0aGZp4fF48xeccnB3FyjTzBmkW1GYtIwWh9MbWqc4NBM9xL6agDr0Ry0mXOoVNTQ1pf5OQWGgCmzSiT5bWxDrbccVj1Mhr01x7OEnek7ODRWee1f5eg7Y6G2rsnlwITMYVd9sIsmQ6Mr4y7IYQu5zq2aJBglyXw2T4athWTH64qhmpsOKl3n.rEy1s7wOysRytbb7vl0g9DpWuJ61n7GlFnwT7zPjMayRQOV_1WQVdev.vea_QzUyIl_JPXPLqiXMnCfhqhm5C4YmY0918W16t0Uy3d3wLNVdmnqqmd.l62UA1zLhxkdWmL9Zq4wOTmnBGSg450DinaoqpyTLmtmqx3ZD3f.vtHr.x4_nGrc8arL.pmU3vXxQTfJ2qztf7q2t_cC97.INbsfaQ8c6xLELHe2w5Adg6mqO4J7o0wRW.AV1dJmyIfPsGD.8xNF8xqUEgyOoZ6exHbQtgUVEFKTyjHrBuDur0LoSU9Rmw.Fq0N3uetQsEWB49QKK6sEHQ5Gexh_5BajqTr7HdUjvwtvXuGEC_t_Nq9lbTrxdB6kNDHEY7xRXjS8sTX9fF09ouzO1IixLup1Clz3UUbSKhBPW_LYAl8_TqSvtuKmgFAfDy0yUwlRrPNP.JwYIMovxbX6.wPzy46suHhLRzDsbyPG3XGOmYb4FkVbhjBw.SzhfFF9s.YcXGC27HhwKsyd5UEoGaUG3zx2.DvYdOnL4064oIBf9DTzbo5UhvWYIJD61tMph47Gy3CIy_0flO2AEQ9b1GzRzHd5tF7Iyb1RGqlkA5ADdtILPzEZfXlWinFAgidcFX3XmJ.Covu9BKumtfM1qKSqVlIIhGAPdNTeFxf4Ob6fQRtsIT55RZ7d3sEXgA16EXlzE_KgfTJh.gMReEUcDQazImDftNhZ.dq53qZbhi4ooE1NvxhNQJWDUE_3xSEEMGL8CxDIsrNcfYotbRHV4DGCgFliLy_6PAtstkdL6P83T41vTgY6eYof6ZkvgxeCQ8R45W6pmftubkwcG9ktUF_loh8f3CFpaCf4iSA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92e476e38fd79d02';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=rf%3A6746011&__cf_chl_rt_tk=Ybat854fe2K5FgTLw61u5.zzv8gl455FvGmy.oL2.J8-1744311388-1.0.1.1-xOK323IKfAs665LmIhJwSO4U3PinBAqkbIB1m0RVHss" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>