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: '92d96c3e3b1d1d6d',cH: 'zI1evTQQMCt22dkH9R8ob5je5V4lfpzOCY6xf9hfnUc-1744195609-1.2.1.1-udx3blB9IY19GgZhDQDts5O9Ye9YXHGURrH.uKM0dnYS4o7ROieTqC97E9Hx5oCU',cUPMDTk: "\/1539.35098?__cf_chl_tk=8JWPDurljaxs.lSESlm.6BbETR14u3GEVwyf1FS_W9I-1744195609-1.0.1.1-3QXLGPkjsCRzbaGGVtWQaVXEPyHNmK_OZFj7Pamq0WY",cFPWv: 'g',cITimeS: '1744195609',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/1539.35098?__cf_chl_f_tk=8JWPDurljaxs.lSESlm.6BbETR14u3GEVwyf1FS_W9I-1744195609-1.0.1.1-3QXLGPkjsCRzbaGGVtWQaVXEPyHNmK_OZFj7Pamq0WY",md: "IWSuf0hGEGmHRzhjQO6ju_AATE98uaNXL9Pjn9D6LyA-1744195609-1.2.1.1-Z3ltVY9lK5ttvlXdKmxEZMVooGYeCuOrpq9HMYQyfEjabtBcaiGJAM3y1MMohZ8TybDZp0nZgbhU.HP1tGpjrcxvXojU3xPgZUacKyTLt7UY_m3zvZHm96md85UbbwYljv6pu5rOAmZiz3FU6DqUrILS1oyTXR70VAuraJP_541Nc_8OyGLLJGUwaCm7zPNd7hH_jx8SRbGQxnlxBfZpbramxV4TDQIjAy1QfVWqbMApyGpoO1GwonglEpv3nkeP5ueYrJMBxe9TqKFwNydWldlZOALdQbGJW8kDwc1Cqnts1LMxxmRaBWxPzaDgXIoHy277OgE3CAzn05W_KFyomXu_Scdgmp.R8lboTjI2S.2x9.flQZEywidP3sBIXnnCL1Ghj3a_EroXoAQuSITxgiVU85fKrui2r.5fF48BMmDQ0Z78gG0bO9jwgs8Llfl27PCMwYVsWqivH8OoAwMDN3zUHUs85XyOMkDoqcAzNOupyHqtuf2S2PpGQOa8EpDV0BZaUZU.Zomls2M0M3svjIyO80FumU9cz6cqErPTzFmbiGvJ65WV1TrOg_w_mWzm.lmsQhjNY.M5My7iRZjscEa9_SjWxVd_PJl91yeBaKDFiEfKcAVJxMGDz01eUmfpnv1wYnimtVnR4nZkOKzroDnPs4PPaQiDsUDQP0gryllfv.mr1iLyvj8IcYDNxi5vYujYlVpfkWhyE5UkmuyYsK1AeB2s3dx_WS.4fJyBIYijl1fhOzHnUn6rlVycmgtVgOJ4L13GoXUfv1mnpSok47zGRMkT8qnpmQX4032sV4Tl8ltuAR0mffctkn9CQWxKK5WuMtQ6QE7_GeVY822rkU9ldp02EWvmCnaHQrGzBrNi1lrnZyIBFWs_7roecLC2_Uc8.F6j7lcATWYbPu_qsJk6L6vHkyhIHzIqpXjZjw_ViKFXrwJyGXsusbIkC4ObCs02s1EzRV3.7lkieqY0Xnu.JOrNXf.QygJjvAas54H1sG7QEAND0Tn9rWPxP3VTu.VyrGyjQfHLoi0W7lBeDUFSQBdv7O2gIxdX7m6f_CKkkny5kLTSDxrQ7d4qTOd_Vu8Gw1AOJHC0vHpNJKxFHJfE8w8EjaPlCG_wUIHdJ.B9X7V0XaLhly6Qvyzrr2cNcbDUNJ_Lg9ozuC7R5f7Fng4mge.__XoEwrvXr5skQa0_OJl9EMCWcRMSH05CN7dG",mdrd: "BVgMmiFe_fb8DSDEO0R59RVm8y92y8z4sRomjmMU1R8-1744195609-1.2.1.1-WpDOYBLLArcVFHgazvWdIeBAGvnegT7hqk_eIvK2_EJm3UukOxIHgrw2tknKCKsD6OYFwiWv4HdsLOvbWHwaU2FI4m.4b1tz4tsaOYtUsuQIj.xk9hm36wvXTuIBowT9Sj2GN3ztN2Dsq6hmaiON5LcOujCTcHsJHTXbVXzWKJIYePAFhX_U_FYvShlXre7ZqcsfQy88YDLxnloQnS9PwANcxics_XtpiWsUTJDZ8BjIKRlW72LAZcig3RQTOZOLFVKkUU5yRrbxQXfLfyppyEHZQ3TDWFwX7H77BYTGKPUZhulNHu_ZNaw0cHkmjSEhMg.9pwQbYmzNJGxIA5eRk6M._GTaUq7Z0Fcd8enEHs72xnKtcbzUQz3lJZQupUuVKzVooyrYa8JRFO5GZ29N.fggCGVJbPMkTZbx_8fxcaXjdY.ysjXgFI6n6dKbxUfBCoFLzhPFPgZ2tfz5YFZMnMcN5YKbg87TeQ7tZPRt8FYswq_9hNZNuEvA.RcVAvNZPaPoKpTA5uDkacsiROjpClGUwD53ZUY_9O5XKJafctOxSjp0c4jBuLkyVgyB5zr8kcNzJV8e7XVmUX66iJUboQuVawejclR2_c1tPxSO6icsTFrTcCQrcXlEZ2wzyeWvTdm3ob5HMDGgNBuWsygTQ5q5Jw2QXSwhNtTMZXijw9eLJmUnWowzbk0386e3_zWtu_gnSc_dBbkKQNmxegfdDgxed0WIKWIw4fn8MUz__AZrpqHBbsJF8ewQDWAc_HED3xTdD_BHqzNLx3pRsrspEiEdl3L18xdMxyOO8LiRaJN6H7BtN2DWQMu6k0LUAjZOQNH2nFf4gCBPxZbwv1ZKK2I3Zhx.ePz8h_cuBSo_84LnDu0Wro7rROoUyaj_zKIjFr4WmRvuJIv3cdtqBBhpaE0vVSiVQ4PGnYimPpr8j9_DuMNXYgC28UiYNpOvxzVVrtZ4PRsU3wRR2.II1xYO.GUl1p7IsZiMNxqgE45DPD2KtmE2jK7MUIeV4E4fK.cTuy0xuuzM8E5SoQnxYoTdhRM31DokJde7Gimc_seheMztMKRcfgQAYti3VTOwZjw6BgTnpybpLruV25nhfwMgO9L96X0jSX1rniP.28ZEfJlVU6qLCHvPkrzhofMajOpiXbQinRNPaWnvU9.CB7Gep2AyR_045yaKi73nwvRYe8rD_BJ7sFGifhADo4F1sFXfKqG..iam7c7C2ffJ36EmzSxfhUPjuTFV8EHT.osPum7SWvRpelCNi0ZKLl6h5TUjrnKE1XM02siFLZSbhbCw22alPBdnNXfpBN47f8sBkBOor.X3ceX2TJ_C41vCx420oHkD4PkRbnJTpuz0HqKjA6sIei6nHBAVgCF68g_9HFtRsuvIZJcng3YigU9Mf30xETUgTG9hPNvIxjohg85I2X7we5eqZ9Pv7ZVoE56e_ehsdoGtFNASbnx_NSzzniFxw6QdzFd6516XMvCbbIw3ft3gvmgXb_DyJuiHfMU001zfOLgIGf5w7bVR4gtMTpS1XqBFRUMF_TAL3jsROsvSN1zKKloZ3PwyOnyzEaJfKGNX0MlFOqyLfwFDhfRND62FZwzYuPP0iHkywHAJ47PdPfyfP8B.1S8qiuNmKGf82v4ophDedbIz2u2IoaZtjeF9GvB0MQTEp4ky1WExssgqCfmZgTDKTVS4_IE2V0vXOawTBnaL1tFmWb7xn3k6xj5NKuDP9tyFiMOAYH4hsqpqJSAAmm4LGpfTU4aEuNg3bX2mlq4kcApUmLb.Cwh6Q340ymFDhD4MbFoHaCS59TR.FcZq7JFbHqvrZ9Vdvwi3UzpI1MimikD9ZUahTq3DOx1UouNijwVL0w58zAANGl5J_89qDsisyQ_byfn7xEV6NO1PanS6Uouv3jqafcNlX8ltGomgQlvN8G.ag7lBTBMjCzKvlqA0_lpkSSqEJ5CILL1wdov2V.U16w778g9PxFoVKLf84QVAIMdomZi29Dr3fcGwmwVEq5MfYc75z2NvHgG.lCKr5JuGkcbglZ.6ujoW"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d96c3e3b1d1d6d';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, "\/1539.35098?__cf_chl_rt_tk=8JWPDurljaxs.lSESlm.6BbETR14u3GEVwyf1FS_W9I-1744195609-1.0.1.1-3QXLGPkjsCRzbaGGVtWQaVXEPyHNmK_OZFj7Pamq0WY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>