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: '92d99bdebcdd4100',cH: 'gGmGZfBveffdGLJA2NqBYKL9jS3OwIxZ7_ibGwXEcl8-1744197560-1.2.1.1-ae.APnBPevfRmOU4zzvB9g_oGI9o_DLUECJyiJGR1HEDZA4qs.KDxjz32VPKgpbi',cUPMDTk: "\/?q=in%3A342034&__cf_chl_tk=tQRJC14A56SOafc6RbJ_B.hNdgdwEVnugLwPDVW5Q6U-1744197560-1.0.1.1-TeOmrV8lDqsp6KnhwS91OWeKFiyazgkqX1WJgwkzsCk",cFPWv: 'g',cITimeS: '1744197560',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/?q=in%3A342034&__cf_chl_f_tk=tQRJC14A56SOafc6RbJ_B.hNdgdwEVnugLwPDVW5Q6U-1744197560-1.0.1.1-TeOmrV8lDqsp6KnhwS91OWeKFiyazgkqX1WJgwkzsCk",md: "Twf3Lie0oWOw2LjKdhcmkbJ3Xn2We5Zxoel39wOedO8-1744197560-1.2.1.1-5MgLlNDYrFmK.NogxmlU4JAQ1PUKi5Byqn7DD6SegvB2vpWDBd7rbVyQBYhcr4zcJhmQcQBrJoKTp21qG38fsboESFTc7KXA.F12e9KpkoeVa.3I17ggGA0PkmFj0eS_4pdLv4lwt.QA6v69.JubU.SIUGg5CAOrhwnAdhT7Uc7te3gWXkqxfRN.HVLPpCTBlsrrxmYEosAfQQpY5UMiagQISQHDIIxNPzwB06vOgReoC8nWrEQz7YA60tZlV.9SV6mqcbcTj32nQnjdDwFnJrWXLrrMHmG_AmiEnCJCYfOGI5T5Ktk7OHXqzduNzYOI4jHp5TII3GSjHXjUcZGZmehqkgGiAH31ks3gwb2T61s.G0WhmKTx.wXYQHP3XP.ebzO6FtrNTkZ6_PpVtxO60_eytoqdk0ysYVObR2eTevrqmDFYnf7FpCo.YwSRvmhZXH0v7ZGPTdGCaE2NwpSbaSEGCPZUx6KAYILG0nF18Vohlqjq7GyvqG7W3t9doe7xZI_W.icyFPd70aaZXCNCvBxUKp_LRvWJL6fTkOZ124izw5Xqeb5eUBluDNEWBVRlWuNhhsI5ySwIQWXZCKHXvp1NncOf5fiUM0kVoH0nB08URn48boGH2GBULxKGT.46UAtXVQZhMDpy1J5wcU0by3bWmozJGu.VFqVn3y7wfK7RcJa2.aefE2WbxoLAM1.l7IDIs7zDAWhvNXq2EdgDKJG8h0qXMvTOgI9scAgCJ3089wUr5G2mJnmHDdGsB9sCI0PTCw9XqBZ5ubVbawN3U9sjl5tCB9vbxG249u0sa3rV3IdWoikJLIrbA7hCV1ht7e3EhiU4AE7ezCRd2mem4lfK6eH7N9QKwCqSXr.9SPqljEtkvttlF590vOcJcWLgwc1uvBdEJ0XWa9Yfk_i9J5SxdbK5eXAPhqhQiVyfPzHo9VIbiU.mlAAiYPye04J9Jk1WbNocAaSY7Z8fIZ4GPzh9cnA2hmcp2smsfLAvjR2E5T7yRT7ulOW2v_kWvcCBQY0.gxNSEKEn6chlQoPJ3jWOm.d12fghe_Hf7gbM2b6qTAhX8xs5bzbWeuomYovyucx3z7cOkrFWfxB8f1wEXEdTuTRDsJmvC0bvTPvb8Q9FBuPkqCfKf2WKJZ_0GmBRorSaTaBE0nGq5aBGGuCCmz.OcE_DoVb24v8MFsPzT6fXa8cVmV9rkUQG3bCEEAoZ",mdrd: "IiyemQ43tEVKBkla6QBBlnuyGm1hcXv_c.csyuvDmXw-1744197560-1.2.1.1-FNrNrh2ozWpHLiSxpmksXzKsVRolOdtXrjBmXyskv4chai7IbSCPzKLxju6x0He8uapc7LivytlEedpdcA_soTIt2SgOQeAScehSMbUgSczZiDf6WQ6i5IWrDsBtHfUIJYYteg2OBxRYNuuj3dWxp84l1KHoMRjYrs56EDJLGayzQU7coy5AZtE2GsQB.HzIukgiHfAZJKNG8mOfmGy0cmQCDuzF8qL8Gm5_wVDdzqJqD5gp2gVUSmUkqjqyHv3sn4NQLuVZp_FwtzH500OdSXk_sCjzLu2JdLHmw6syJCaIK5GM3hm4_7aoUCoS49yCQMCHHpL875vT.tbX_qRVvvGeuAXyTJSZoDLanhkHNCiNwGiv7IlFa4fZMoKk6Omj7SCGVdt392AeuPv_lKtlvUYxhPfcbAYNHvyNFcDaiIoT0aWTDU2lnUKBrcFFl0E36H1WQQmlIw7iWZi19IhKfOJHiLE2sEw7L3jGLmFqf7FthBZa2Y7rumD5RwKRexZSR64iM5OSoO0aaKRZZOxdizeRlt0kSfUcT_UzXh.ZSy4Tq1t3Qv_5sQv1ZKq6i1IHcNfNGYHiDG16E4inVNx2qgw2feXX5Mbz9s4h9_QXlEbFeCEK_2AyluNT2FV6w1aiOil_plWZplx9ivt7DnjRhZR45fJr6dZZHNMpv1cx6ydUGcHuEkuWs1wRMwr1Rp_b.sLOtN2.fiRr17uazu4rME7f1jmR54U9O53ZIR0yYYpOXF7GVan_O1hslLCltk4rh3fFKI7xNMWlBVyvIRuIMAqSkAmqGHa7Tkm6ckzf4zPC8lKIPTWTQiiKjnT4Wgsh9F79eX._Ix43yv_zBmhkbZhRqhC_oI6BrX6UK63gnacfSCX3e8S_yMwy0MCcF_k142T09KPFOvQtSE1ALRSJPk0.pSU.5FlZyLx0H_Ya.nGOtPvdsiAIsTiDYWosBEF1agyGTfcpbhiU3Hi4zkPmpJwfgq4Q4GHNm_NFmrasLww9HtJAiTmtfbBiO_XjR1P27jYRW_awAY2brCH2WfFwE17ze9tjOR4ptB1bzJq7zTQxPccR_9QCarm9NkfwctXze6ZN_EyJN0rUZFgiRTVs73HCmo730KlVhvW_96Ds0nzv3ELDvBrChwhFI9xwlLvWATiG_ePjvb4SpBPoBAOnAePjbyC.FHhs6Y6AIBPUBsugNVLwiU8zRtBJgAZG4oH_Ar23jpsGc1Cu_mfBCWCTZIG9MrEovvIJGntMeN_GyPtU9UkpYSiP53cLLyGKF6T4MlGW2Cu.0EX9mI9Ud80ygxI75BjHMhDs9rf.hCMi1LTKKU0VRmV8BcjXSXpQsvS7NHtydWzyFwsmY7aEipfI_0XbexU_zvGAjowas4OFiJQubukzd3B7qqHfVOUc_rRyHsXfYkMMObGfew2i8W6_0Ut3o1_tYM5rkPENkq9OFkJ3uqBDX6HFPiDzfR5VepltY4KkfO1Br8Z4VqB.OF.nRFBlSvomCZlG0O_ZWNjVT1TXK3fBVct8gw1zMB9hT8D92nekLBJYbi1gfbPUEu.Yk1KfqELhEMIBNztBQIaynOmOmJndHNc7qx53wEk7Opq4ITHW.SVf.a0yIU.D1V2JdfGu8sACviSnsf4Ds_vYVogPy8ieUtPVmE6Cw5oh4j1vwKjnbus_W3acGxBgeW3ZzQ9nmkTv2Rx6BenBqdMb.7ivYchDsRkJ_fWpXp3PFpGIRWPBge0T1Qin1JI96Yg3mIS9AuUSPQa7RjwxmyAdSJlcMujjibUHWFt9UEXER4UISt5Ts5UIoHkoktl_r_4hNbZu.sCX06fKR7oK3U.4SvJh_y2pjMNxpt2HISiMpfSTzYnrJzpafZJ.vYyfdhZqZEorrzUG53.w6prebxBZTORY9XPWuRAB3bhgeOU2_g5OkCY3yoNwkFroEjaz_7NvYwveb4vPJqF5VPIk7yNf5klQnvnCKV7v79XTnA6Uy3.xXSr.WEiQKwM5zcHbAf9yBkq5MPDBOFEwTAKoJsqWOsBo.dETfz_c1f28Z7nxMyhq"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=92d99bdebcdd4100';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=in%3A342034&__cf_chl_rt_tk=tQRJC14A56SOafc6RbJ_B.hNdgdwEVnugLwPDVW5Q6U-1744197560-1.0.1.1-TeOmrV8lDqsp6KnhwS91OWeKFiyazgkqX1WJgwkzsCk" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>