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,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMiIgaGVpZ2h0PSIzMiIgZmlsbD0ibm9uZSI+PHBhdGggZmlsbD0iI0IyMEYwMyIgZD0iTTE2IDNhMTMgMTMgMCAxIDAgMTMgMTNBMTMuMDE1IDEzLjAxNSAwIDAgMCAxNiAzbTAgMjRhMTEgMTEgMCAxIDEgMTEtMTEgMTEuMDEgMTEuMDEgMCAwIDEtMTEgMTEiLz48cGF0aCBmaWxsPSIjQjIwRjAzIiBkPSJNMTcuMDM4IDE4LjYxNUgxNC44N0wxNC41NjMgOS41aDIuNzgzem0tMS4wODQgMS40MjdxLjY2IDAgMS4wNTcuMzg4LjQwNy4zODkuNDA3Ljk5NCAwIC41OTYtLjQwNy45ODQtLjM5Ny4zOS0xLjA1Ny4zODktLjY1IDAtMS4wNTYtLjM4OS0uMzk4LS4zODktLjM5OC0uOTg0IDAtLjU5Ny4zOTgtLjk4NS40MDYtLjM5NyAxLjA1Ni0uMzk3Ii8+PC9zdmc+);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: '92ea09217e8cfdec',cH: 'A7pJosZ2Q1ecYP9yFhQtSVojOwWbCVnGiBacNjQvIJU-1744369807-1.2.1.1-0TSQ10oCW2bCZEyh25.sy4nfJN9JUyqxFJ2_mGPxxAvPr56pxuVhTX8XbFbP.jc4',cUPMDTk: "\/07551083?__cf_chl_tk=AwOjeplcFZs1JdlETvcsx0qMSFI7he75t2V4n3ZsmJo-1744369807-1.0.1.1-LGgHMDQR3zz0m7zvXBCobTH92S5SIzh8JhLpN2ZdJR4",cFPWv: 'b',cITimeS: '1744369807',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/07551083?__cf_chl_f_tk=AwOjeplcFZs1JdlETvcsx0qMSFI7he75t2V4n3ZsmJo-1744369807-1.0.1.1-LGgHMDQR3zz0m7zvXBCobTH92S5SIzh8JhLpN2ZdJR4",md: "MD4spfevzz3hWErba.VRQ2yPtEozuY2EwtbR22LtOUo-1744369807-1.2.1.1-7ykR7UifL3Slm6dJasGTKV3MZd603dTZT2To0ouu9GdkHPy_4NhJELDG.YrmyEJWE.LBMHRFkY2GnEW8vDWDAku.52AV63AjkNvWFVaF1L09re08.6_KM_b9zGKpJuI3k2ZXlzWDMwuXeJPaHh4LgxL0ihtpIFQaSFahFZ4pZ1BtT2.HI_TKhjoNR.8L0jz0bf_xRqFbkvTSWFzQZ2WoXBR0DpyESR_AcPI5HR2tFS3r7x8jgqBeDlwGjrvFfKT83j28raklwqV3gyAEdthMRlpoyJIjMLKz_mHWQt5kJ7mwsADuW4R6PNMS8.R7jq1SQ7zM4BhXE7Vs_OgiEj.bjbQAw7BG4zwxNYQm.WsDMja_08Ga70RGAoPAnqs7y1AXrrkYrztpL9tsiZ0HCBhYoStZ92CsnrBW9kuEaqhC5NJaRz.CKqflDK2eHLHnE05XrJDwt6IRhweFfI2Z3S_asLzCEYPRkKvibIra96DdgE2_krPHe7yl5bJK9ypzpu4l4SU2Idt65DKptgDgYdpA4Yb2WbILr0YJ6S5osvpB57I0lQvklIvAOxK8azsoU_W0Jz5W2ebL5FBquubRw1b8FPZAgzR5gVIqbnMkc8qUOWUA2njBnY30I78g8QuWTJc_K2.e4mP6c_cnDPVuy7ryRhGEE8bfY9C2qELFRi6FnnxjTEcEMbtoAOSQXfIEXJx_0ZCQWh3EDdu.bL4OVWkD.RfELXcAlnkLatwIWKNktUZz7TaO2h0XMsDft1fwY2DmlyfHUwvIrYnjVLybslGg3gddRbNkUG0az762JN03z6dkfM.xm.M.wEqaPFs8PbcozVgVPXiAmAhUBdJCIcsxb.o5nWP3zm_oUZCdKsQoKucU1CseIQ95YUZJ68sX4_wd8OvFOXHFpuQwbAlyBhDm_QMssF5RE8i7R_4rWdB9l92O1QMPFXWxDBmzQSae3p8eNNgNpRWVc5U_Cx5VbtuB5QgAsrZGXf.Pjdp24FHoJkc2iVFN_eiqN7i.z5htyomLyqAnnetmsQYmr1jozZCC51PS9wJW5zx._rZki3uNbbPq6_SE7TI2JsAFfbzDutNQrq0cowuRyoK4NTRhsjBFFqoVV8FerJTm1UGPDUEpXZSZIBqMQZLW2CbW4kYOl7c_ftNfWJYGyZ1TP5uVvibY51lws7UyvvTkzgYQ2cD7NJewsOYt3Rm0lIg5fAcJXGeQ",mdrd: "Qw2oe8gvXNAyR1ajYxK3HhfSHunCXjR4hZMSXIQXrjI-1744369807-1.2.1.1-unwm.RO6s5tpjwJwkMkyahCnCrtL4MRB6Z5jUWmDop9x5GzzBLfMItpPjUW2FNa_UiQXXNZnd4KhuSyhupgF6hjHeiP_yHvdnq81TSbhNzkg4ALxZDoJ17_fOotR81dwRU0JkpUq3uqEuVKlgLxlXQ5gnHkXd7s_nzrtf7bOXxR9gMcx3m2uCDpUAKHp513gyVm6OD7yB0UeWxCdPo8wacAlyDhSvyfhACOEgHKsThrVlb6z.XYUQqgVNMOV7KsUGoUxCHe2VxGjLYEOuJWf5JUi2asTME_aEKK8pdkfqh06fs.GEPj1b.nYtsK5OnptaNWPFqRXTOfH1.nUjLwGv1UmQKWFw_.nUtJmV1WLtzg487hF2UzyVpZalMV7sa6ndsZJQzcIeYIEcmwYrjjNJjDreHGxYqSu0T7UnPahUdj7P8jV.m8KTKvoqRWc__szKsN9YM1n7MJeUbXRCMXpt1daY9_W8J8u2rJzIEtvwAdBEqIjffK8rc6HR9RzAJGWyeeyVlQEkL4Ob2gE5NEp.7ZBWeh.gz.WssWB8EgW_9h5BCEuyYtxNuVGg2aoJIgGPx7UtqM5.7wlzdATZ50Z5l2CPfu9w.HsBVQlGdEwHdN0pEe2NJ.8rMSUY7obOW4a07SVNa.HRHhsv0nyhSsfNBqr9Grl1PdgsNVBTBCJ4X3sLMR3IkYKstBmMZrWpxVEZtOSSkzxs8HTNuadwT00RIHr4Y1nY.dqJ7lQhQBWsEgUCNz8mdF.RiplQDMq43xNjs1R.9kzLUj0YcHTi8YXUC17T7rPU2tiRX8CKC64AErc3Gnr0ckYwyQ8vGpCQ3F1A2Ke7H2Whi6.peedY00l_pDxGcFEvbm6bA_9bQ.uWdK1BorzP2V4Zj0HBFSAxH0xHcOisc8nb_VboydIcMgArm1g_DkgiCmdRW5mQvhQSiyHOfi9HqrpRJTu0Rhnu6lnQQ2vBLjR2nKZVagDUqUxfMziLm8imIeFjtL.rtsbwKRWn6toY9K_IB7cT_vnZPGl1cIXu2J8WNcAf5k2G3TwDPLDzIgBSORcnEdGOci.H_hHLGHLafxLOQUFUWR7Q52xrr73OuKmS9GYbHkBuW9A34t1Re9nOBWBZenHlI0nOxyNFRDO7sTCiPWDGnjQ6F30AeXfJAYF36op9i_AxVMnwmQjc9RvSR8i28eIO0Ah6uwMrpe4wjTLrLdjjSUsEC6hR_zas2rZSC2QwvAdJEhgkw08AZwWTXtjqv02EEJ3KnJ4pkhYHJycWg8WRxDi1HmlRkm9Q6wnq7OnDyN9.zfhKivRmhlXRMlprcvD7onHJv6wJrX4wsGdSzrfdzdGjLIXd0KmXynfcNqKHEw06MGLkYzWhha8Wn.vJsIHmcdfZCCAWN4G57MNYOVMPQ1yz8izyXXHHBkS74mnN7wIVyYIBifXqQSUOABiAgb2kTPHQNcaJTWcI8TUWFfxSy8Mp53D9As_xHkHuUbIhLSV312EZj1rG4JiBuO5mR4wHryv7QC6najvqn39n07yQn44W66k6_H.nNeKJTOMs1LfpHeVf1j5W56Q2_gqd_BYeXqHCpble4rJuF6ED.ENeEiFXUxfBuMdUiF2QxWyKCKFWdu9AsDLkuQh47y8cZqwDQlhe8I_vBpZVp05AlhBJE01IXUmTv3Dy5xZVqEV.jpMaCw2PiVwFLiKvy6xnWj2SlLQYf6lft8a7PV25xeXJ1MK6L.CozeX9Gu45rZCzjkhyef42DO4YHSfs_5.C_AFgiB.W9nuztsTVcYcwDGotNVfPthJkvlwRlajgzqCfSg0uyNWu3vqD3pZbXHPemYJaoKE.gAC.Izc9URIgPV5jUmf8zDezwf53mf_as67RZWYjIfbys_NZZ4odzwr6Z4WSj39xPI8TOhedW6Mq8WZ9qWVDIUiL.Wdj_kZ4DYAFZce3WwNPiioQ2VgFpX3fNNZNLkpwqJlpCs2fDoPr4kp_f8hLw2wU61fvT6tGpENUILnrR.y72ZvWiMSgAfIqjX_8rhHtTt8gw62AKtVKdqKg3NYKCW0"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92ea09217e8cfdec';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, "\/07551083?__cf_chl_rt_tk=AwOjeplcFZs1JdlETvcsx0qMSFI7he75t2V4n3ZsmJo-1744369807-1.0.1.1-LGgHMDQR3zz0m7zvXBCobTH92S5SIzh8JhLpN2ZdJR4" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>