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: '92e16cdd9bb75cd5',cH: 'aEe._RMemcdS7aAFua6_izpDeATfAg2MWFzgLKsOL7g-1744279520-1.2.1.1-5LdRiVzY5RC3doBN0GttMVWnzoAUvy250Rh01MhMav5sNMmX2kYWMwyNdW1UIVCf',cUPMDTk: "\/1116.26016?__cf_chl_tk=WEWECM5PELxlzylbygI78TNfXJCvYon._Qdb9zzoR58-1744279520-1.0.1.1-BiJwc.L4EJ9EBgfLCkUZEBQltSS5y.GCQjnZT6ZNLsY",cFPWv: 'b',cITimeS: '1744279520',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1116.26016?__cf_chl_f_tk=WEWECM5PELxlzylbygI78TNfXJCvYon._Qdb9zzoR58-1744279520-1.0.1.1-BiJwc.L4EJ9EBgfLCkUZEBQltSS5y.GCQjnZT6ZNLsY",md: "zglyWeDRcr1GXR1RN598gH5ow1lwTILsmGirbV5DL20-1744279520-1.2.1.1-6TqwadrLt2VrmYudX26.hQ3M6PmdRvMOB9wVS2WATqprMKupl7sNu1VnCTdGFDn2_F10u7tQ2aQ0VZop0Taxu8AngM4HeMqLK2nPMtQbjHyEcT4_vVbhPswrw1yBnv5xqLVVDCexb3rH7.fs308XYjWjP7ttJmPo5uFPE6E0F2m2PzAXSayqCMEHCXR4uGo0b04L.3.4mPI7qJ2QLQS45Yn6zOveqVkAb6A7RjtdIc52z25Y7n6ETUoKwibfysaHhT4nHWC.X1WP.G8GRX6QrvDaScgrOLQkeJsASfCFTYBtK2Lucp9rUWiWEfyANA2MnEfAyp0pg2LOL6ApS7ro05Y_.J0Z97hnBA4qzlL_XMpoNwrMFC8RSVdDZe1w6ibFB_LQb3EBs1Ofd.KZOhzCdl.SVo4RWrJKjo5w3cA4IaTqzf2yAD8yQFD5BzyaJjcVoI7tl3SJLbAxj8Ktj7McNoeP_4yrGxuRHzDxBr_dPZ7k988mAFG5asUlq7QOtQfvlmosRX6tbYat8G_0p2giQVq.uJAMhIkeCGJKEj_McQa6QddvCYqkMb4MliA_iijJnR4ZxngdbTUrGHGo_kZy36FLHFMDztR7pOqPFJHOfa9B1L2tvc5g4SBsuZ2le3BwOnr_GjOIv_20xpCfy7sAWsXhzOZhIJ9i9cjVJ4LEVYLYUAJ2K_DWHe7J0MT9yIrn4e1naI_STq8Zz6yj89Ay.ueGCl9tdBQf8pzQrqd8bHFj4yphBT2_Y82HQhUbkrIY6TvTaEQKGd2nRGEpTENCm_yIC41ble2pLux2mpwfcm9iPmOKqPLBBfi0ju5NRcm0g1fvYBdO68muTPMtioWfE9.zjc.lje4YPLJhhf1NnjcEUV9itZfBrlWWegHVICxiP0WEPn0Mt3o4wJDi.qieaKZluMrIcVugv15LGusOubWD.3OKu1.fXsSS6E9KyTWsPsRWa5nv9y2HwPWYuOEOeyRUg9c_BeEUvtIaxXAwJruqCUK8p1bFmqB7_ur5dguwyhdtXMzCFoLq440UvvHV2JV4L3zMEYImIhvSVQusvrE5i2rv2imQt1bC5UMpmwC038PIFP7iCLwJ9DmctlOrSDWfoLd7qw7AzfvfI7d79Ft8aoKvCHcencwaJ8pxiwYiHkGXQ0H53uQowxkUfjMdW7yaiXsZnHIWA3frBf66ilBQoiORKVP4AWsbNEBSVeyV",mdrd: "Paytl8JgaGhSZxM8iev1fKm66u76cog8yBZGWLyu_l8-1744279520-1.2.1.1-2DbpxyXXG4zBrerEzjImRQo7n7XJeUlbverYO60CxjaZ0K5U1ZwWZRLvETXnGfZ2xMysJ5TOwCiX99r7Pya7eKUaBOvqEW4P1Rhp7BciWZQWy_DjlNpL52xxDx2DTgCBNnDLk2aytE3yC0Hw6D1bUEW89OOMJXv_ytHdPi0C0zxaJZ1ergfG3H0iY54rLcCE81xhuHFDovs4rz7IyIza0dMGaQ1mwdKx6ZDBX98jqyVFzwG7H6YQbvtJ3Qzp6Y39CgK0ayUZ4OeL.yqxQlVyhDtRWpbGPh6zKkb7JrGDrkrS926RzqO14fcJ4uc2.FtLk94898CrBngXhta77rg_bC9k3cb9N_d3DzIBrRFPpI9aOR.2zLHyYB23hI0OJuk0kTGr8HJOjoeVLB5nSenA6VPeAlZbLkkLWB4JQr7vCIRBpY0dKI6YSK0f34gngS2CGa4g4lmNX3II6lA8e62Rj8qI28Ox7lPZmoltX7npzlRvLJjqj7zfltB2ENqlGiFr0SGJlkc3eeYXD.Y39ZHrKp3jxnLRiMdqjz_7cUvpao0H0p0tHoZKFj8wdWAltQUD6oONygOsmI8nHFQFDFky0VNWsc7PZX.98aN8oIGbnYXf_feR.2eRIscr7OCxGQCN_EmGvA7GUfNKyDO0gHhWj0NIUnwTHlA6BeM7FUu.UNzHDn6luKFZ1WAqPPyvr_fXx8rZDx32yfDrzUcour28fbh3gtGZkgtzPz7AIIr22.W393YUabKt.tBkRG8z_XCrgboBdDuoSN2q3..kPzo7Ed6WQ56T9p8rwN4fuEGn0_lmheK7O9dUmk3GAsGdNREfuDRW3wyU6HA2iYV68UeTJnJnodMt1XKJNHOwrQXwBGaVFOo.wb4s_vnZXNO1zjVHAEOE7D9QNB59HAROCrYLC2oeZiuOV8x2oN6.tbvVFGfTSNDwGXAO1TYVE8Hs1b7GmiKqVfHe9KKiPcefeMmPTTxtoZ8ExmI5gAKwxtbyjuv7WT7cwZ.6ELBJ2HNy1UEN83kW_aElzYn_pgxowD1_mUzYO_2ItAS2nWkrROr2rYT2g7IWDTXQwwns5wMTJhiJKCWhzoXU4OABpys1RosC7QNJeA_CUJ6dU9ICsGA8hlwBWrHgGVUkWeWSF6_S4eiOXHV3uCW3pHejE_7NwQi5OBPDxuYbthwWb9YDmdTr5RugLv6BxHMFhvcNu3w_yD7xQQUgnWlRXK51a2ZtXOGcDqcsoQuAJqqFje9AQCduFC6uaGUS6_lVBfuddj3jkJPv6K0aUqHYY2DTon93rS_rrfIQearY.hHTJ6N7CpGW4lHNFhik6OhAB_y7PWScZpaLHY_SYfeynypmZgrd4h5eNPrOGiGxrIszroqrnUbnyYcFRPOzzf5ycEkbSrqJx3CnkgF0WCBM.RNnvxcAgNApUwA2gOhi_upbKj1t1dZnweI5Rve53gBwDR2177ZAoQMD4kE1apDj7javkD.x0Lzm4ZDTGgGgarkoM7ydohVcxKtRhUyhp3FlzenGmITgY7vpQn74eKKhuPgQ_9wI84HkswOVsVllVHmpSUGDnKs6J_e8Thz_rf17MgJ7G8c.VydrlA1aqFg4vAVLFbs0gwY92j0nFXapj44iy_WrXoYTQ7OHJat2emHvEpaeqzcByP0a5l8UINiD1hD0v3uwRXt7L5FFHszOGgCwSR0oyrUnhWfsZxlIQeljGXrN028JQDMbMyWXFRQiPhTWRGF8ioI56qt2hEmTEo2TeC3Ci4LhQLWZl3WTWcLHh3XZUuRFh..8X2tdhmXgnmQi2CcH29.HSg_KgvrKr3v_n_juwZn9_5LpjpqmUlcF_jvtN05ez9PQhbqdf5LZ98Gp6jJUOgxIFWmcR0DwrJnCZYblrZQEUZ6OB0aj11LfkMuXRRhdhxVhQ2fOxVg4ZTQSxN0i_Uf84n.ppql3SwNi0JHDy8y8Eh5t71MzT_pdLJK2zScmcpvM74S0e1SvheRttHhbypJRFWnR3SYUUAu.qBafoAXoi5e.tnJ7fQOqGPPrEGW2_U7qEpbsEHhGEVM9h_r2NrSJiA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92e16cdd9bb75cd5';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, "\/1116.26016?__cf_chl_rt_tk=WEWECM5PELxlzylbygI78TNfXJCvYon._Qdb9zzoR58-1744279520-1.0.1.1-BiJwc.L4EJ9EBgfLCkUZEBQltSS5y.GCQjnZT6ZNLsY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>