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: '92d52ef11d8eff7e',cH: '4LB0qh0eQ_cdiwYqXqv8YeV7JBAc9vuIS_eD_iwqp5I-1744151155-1.2.1.1-E.e_cR7EUwhLSlM7ogecf9ffw_91T.MSAm3SKkJGec_0CIE1ai1BR_u6mA7QMBdZ',cUPMDTk: "\/serials\/98?__cf_chl_tk=c1b4EHKy3pPLamhU_jOpCk7e.TIE30i6_pV4bO_Q_iI-1744151155-1.0.1.1-B053r12jl7TBTT5I1pkUof09BsMMY8YJP1NEg08m_Bk",cFPWv: 'g',cITimeS: '1744151155',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/serials\/98?__cf_chl_f_tk=c1b4EHKy3pPLamhU_jOpCk7e.TIE30i6_pV4bO_Q_iI-1744151155-1.0.1.1-B053r12jl7TBTT5I1pkUof09BsMMY8YJP1NEg08m_Bk",md: "3HUXnYa6691oZyEsjSS9v0b_OMX5ff2HT6xarNXnbMw-1744151155-1.2.1.1-P4Wbxuk_v9CorkVDJ1o4_gZt9EjAlIJL_6nBJih3hy54sF3cwGAxD9.5075rH97_Ft10tzMj1O2eOjDh8Sp94gauqalgEEVcNU1HXezeQ5xZU9S5p1ZCGaFi.sHdowGdheiTqQcIwKBgbwLxuMze81rvyGpX8IXhHBHnHaRsMD6mTW2gJZ4e7W21EqYNJHG3Wgf2LTaCCWxpDdiMZsBaJLbXTHlOuc1ShyCRcDr7lB2p11N1K3ESJLYjvZosRDsRbKlde8mjDg73Vq9d1.7Qo1LNc_3LEPoxGOnn4iU9ppEKl3xUBJE.KDicW0XQUZhIjGJTfkmWhUvAnUgHFXNAb2Pgo8PXV4FwxJZDP2gyWICUpGjB5pFy6EEkE.jCHyMQ3nem8qLoOuBAuqaf27Z3lgkSKlpTnXHNW2tB.ouLMcg9zH_Q05IFDNUZM1DgisjBsY30i6JEk0sAfHGcn8_zYYKmIKYyqhg1gYy.9nLkY8RopEiW5i06VfUCnuFw8d9mXptWD3oZVq7APVf7FmF4cqRG2ckYO7rzWdMQUZHtwEHWouu0.v.ONXgm2HIapynBcyaIGPZrHnjmQtq9x.8JtU_VmZMCkbOM_wyANcN8lTE0uysJqVZEE.wZWrV6vKG7cUfLmfFWcvphy7RwSBWXmQ99zQfZeazX8xFZdD1JAD4FTgk61BrhhhizjYF9XUwZkJxKEWebmC_exlmSXz_gb9p2GW2t.AEuYIXXgIdwCr4wOxcp_3wLkLiO64RiFbEVMZvCsTmvtmaNHRB0br1UTydqBnq9eSyuQP1RwTl2K9I_kUKftwT_JBPvYanlFC9AFcQOUzqFmUizjkibLygVcibNyW.sRd7jMJ_zP51AYIw6A1z0uE94_d4Djbvxdv6WjRPI1wlOGN13Kq82gTm.nbdy_YqJW9ZoCphPiNjmsMmLX2lNETQohK.wBSX2DpPWYPC6CS1oGsiqubNhF5AXWD_WpAfJAqotspz51HrKZNayLtCQ719qaa7ocXs5uTn9OvkUFXD3adWdK9_ANDK.BZXqxN.TqrNzJPNfnoDdT368euVZB3Zg.8KV8EJjyliUE7TESmT2XrpzZhJz5vYVeEMk60LRPEXNIJGPHdUW5JVmMklesie75OAXxt_ddhvPsC8ptCghZTjnlMZ0Twp6ewnBjU6tsx58neu0lIw2UcK7KM6wor8QHU_etD2EWNYl",mdrd: "n99DYbhKp1LSwQmKcfl6aIjlrf6EkG_PN.Hx2LNG654-1744151155-1.2.1.1-_6jM9_GRkL6X_kSN4qXGp10MfG2JxabYsUj3BJPx3e0slQ3EKks_qVEjdQ3kfe6Z0aulfjzKoeoSpsLsB6ow6oOs6jfL5wGK5._nZGLZ.iDXCgBT3xRf0iOUWEe5vWmRxOntrdL3HSHir4SVZZsmd7nsqOO2pLFbFiPVrQ.a.zGmrP028mr3zT0a2JuoltYlQ_wF9CBTVcDGI.IoQ1VPRKQg.qLilcXpXD9Cv167PcrrZqcoyqY13rZg_lZYfV_Xm_Y5IvFgCbVnsTIeuaNB2rwnVc19a94pF6FQI59mwZfLRPGkU1Gr_kkQOBe2F_g6xyljZ8PeCx9SgIjmr34NtwVd4wjI4lFJJVrZLrM9jC0IFZ3KXSiy2hGn7LWX7X0dvCoyS1K6UDYDWKoRHloPPaXJxZXcG5hokgeU4q7slCQ_kFoGtNHbDmaLlvhBag91V9dKzwbbYbi3TFAghyplG1e4e92lZJRM2S97ZsvdXR8CCYu03JgAtQ5qGWy22YarW1Oo9rgjs6jK5udm7AGIBT4d4Btv6Pi.Vx0.Z4qFUXHGjLeZfupL4_pS2YB9xZEKeYhQC6MwVPSbOrSKG8_cSKRPnoSpAfZRfJuU.rYMMnsVdOLuMbMRCwmunbHRbt8kjpn8VNFf_iRwmOix.5JoOj_89C1_OILuI0TG1AHOPsTJYhXs1ro8Z4f31p7HI9v65zZMx7hZf4iTg1k9BlGE4ciI.YifgRNi147IW.rZq9YcbpYJWQMwHzXBBB7xfdi1UqUrgWpQCMpY0fjjiiDAj2EwaJ7Q4mp97i93hL8ikKIMGMHrMYh9AmXtovVHugj6je74G.m9sITt9F2gw.fg68VaDUiEvTrnc0Ue0g3mKyH5yRwGyEZ8oyaeMDqvnP_uhLvUTJ.usPo3mQB8Mp74ACzjoAOkmJLuFqie2Al_alxX5yie5OYSQuWPsYlLTvrAmWDfpH3QFHDJNfpK9ZcxMt0K0GeDghwzv.kiZEo9m0197fs4Zed1N.3THdijkesOrvLu9a67ISJgLTlqTlTxoRLomCAxZOh8o4YHO.JHASRJF_CRYGmVPez.jUxkSuj4h6PyMXk9bmijC8tr4GmSZWerENavNtixKGoHu4Pj82qHODHWZoLhSwegXzmqBQc28jCCD2x_EfGdsvxYW4vRIoXQZpEIFoGWCV415hIxscGarih6HWtkFzVg.TPt3KJ6faF6Tf4yD6U8UWcuwtZ9RVeJjOfHczmHEHSd.GzAN2VpnwKu1PlkHPfWLGYpy6gxw2SlHoNc65BWBQYeYrHbiLLOAcak99KPhDkAooB82V9zjjNTSwOcvDQFr436BwQ_IxdzX9Zr.d8w_LoT5pBwqMvE6ExP3GFV4QplZ41DmdRPNBK9OsFpiIsTMoR8pt62YylYy9RugFFnPv.FWHfGv1wUJqIR48Nc6leZfq1IfVijrQFdYUefDen9_5luVrysXg2H_lxiSy0vtZueynFoC2AKuHUwnUN7bwvHV7z10mmfrdIcv35AogcP3AweJHT1HXq3EbyehtRenDQ70pD_7_JGjWTUX2i82myvdL77UUVA7UvgxMyfDrV7xXj4MiWZV5kL9mAm6SgLwJhD.P20grfK0MdclESJrZxUOdB99s37mYTpBcVoCkrRkZ4.TsvUO1pA0egsuc9QFY0lkYgva8UxqYdyr2X9QqyfosVdmZruwvv8cZdjGrIC8NkddnTZBalEn1BnbH57VYhHQgisR0qSJ983LlfplXvcrSNq2KSkghp9qqXmPY2CnK6vfmeeggjlX7wqH3cy_EkXDRGqJL.KYIdoBs.8ouVFC6YlQyjTvLF1Pf8BQZ7eo.eH3j516tBSEqrEC1aqU3R891FdCfaVYx4Sp4IwaGZoMv7QEX.Us5jZdD92QYgJkAAiTiQDL_knmb3ECcy1ZRUe66iTfZY.puJbMES5dmDnQOs97Zyu7mH_oWwPtD4N7zxQGYk3DTyHJRmxGhbOSP2id2tUA6dXcCO7.G_0f8.lt801B0Z9Y8c_v9wUkNUe.ZJfQonS"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d52ef11d8eff7e';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\/98?__cf_chl_rt_tk=c1b4EHKy3pPLamhU_jOpCk7e.TIE30i6_pV4bO_Q_iI-1744151155-1.0.1.1-B053r12jl7TBTT5I1pkUof09BsMMY8YJP1NEg08m_Bk" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>