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: '92e51b2b7d093e3b',cH: 'wsqIZn2K82_vMuHBsTN2AD8JaufHi5LjH_jYH1Z_Rfo-1744318117-1.2.1.1-3Xi_X74BRjuZYCKZFVn2Hwn..pQLFaPRQPlDDQHS9IrqDsL1A38fFaMSokspMLSn',cUPMDTk: "\/0589.65031?__cf_chl_tk=MxxUXQGjRnZgUjyZ1pQWxjM93nPohH6e0DC60B7qaZM-1744318117-1.0.1.1-GET1a2uwf.CwFVVYv_FqGScJyrMcvC78i40lUqgnfQ4",cFPWv: 'b',cITimeS: '1744318117',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "unsupported_browser_beacon",fa: "\/0589.65031?__cf_chl_f_tk=MxxUXQGjRnZgUjyZ1pQWxjM93nPohH6e0DC60B7qaZM-1744318117-1.0.1.1-GET1a2uwf.CwFVVYv_FqGScJyrMcvC78i40lUqgnfQ4",md: "2IO2Db7hDyWswBme042OP.Hj08n4YjCKqiOdoPblpfU-1744318117-1.2.1.1-lCN20vzNRcNvH.7Xt1INCbUtWFIbCevoWYLyCn5DvHxdCh1bJyUFQbfSVjh52SHmnSPHr8QHKzCP.cCeizHqrK4bkgTyu0oaauu8Od2WZqhcj1LRHGljWi6P6Q1MK.6ecw98SYFPSx0IRbu.1vjTc1epu9k1ZMInjIH9r0NwAbnhggGJVVbsmStNNJp2JMrJUA7Mvg8xPg0OZliaf_mfMReH0fuGuFXSotLQOklmAEp7eq4dE9HnbnCQhTgSwUNUdKc2JSxusNQJa61HgWSnwnoi8zDOAEeXoEmOMxtKRlkOcK2YaGxS8GbUb8e6yCPWAfrrVvvVHExXU6SIkxXyTnRu5CKc8bj2B75hcPDidyZW2560CLQ5TejvyA7COESDjGqYrp8yGCd4xCbLlB_7qDRoPlEyi_uy8O0MMWcvbV0_4bCaFwbxugKV7pvE_q9to4jCeBgTQiKphbm1curqMVJ4uwn21ZnM2wHxSUoKwn_FqW03V7Apolp_nocOgDwocwWC8F9wIffXhdjSxWMdxgQNHVXouF3Ti57C5TPhm.NoSmgwOzG9jp3JE2hfw7ccow6OfCoSQU4e7JtORHSYqDY6TYNFmQVz0V4MdR_Am_0qxFyBoIB_tqfNJpx3KjlSEo7PdNYcX7lstJRMuJh._6KXkKSVZd.o2MLMhi3fTQQDVBgI6aGrisxuRYQFYE0m5oDc3VCQOQWaPbRbSW6_FH2xsxXjQWQqImkpXRTUwgTtHGx2fs9QNoCYGKqsyrCT9dc128T0EqnL6OqWUIfMV8Q47wX03ctPFG6wBkaUTKX1LosTplAtmHCGGn7eMMKPbTjgGNhnNQVhb6ao14xZr4dB57GbGuTMetyTZtP8XCHL9NJt8pA0SsJKIRNa6fslRZeLe6OMvss4L.17aVOJDDL3PYAzsrYhfszl_HhJADJYpNs83y0r5qdQtwhia_ksO6_gNIDrqpEuTTlqJOpT0gzA0Yny_SidsxTDZVt88MkXIColigaGNXDvc4550EEuX813hbb45_QDLy34u1l0jAgfyo4sdiimtpMYwCLeU5htRd66dQKE5Bv.nXLZlUu4RwoSQwIz10rYlc4tihPnVSbAtH55_nH4eYQZZJUFfVeqjhqIR2AOOQmOwxWsI0ZMAR65JHC5z8SrKneJmTkdSeoHW3ojvWc22m7xr96J9vxcnyP.p5..vgsWlTfy3PLd",mdrd: "rhuRWwSmuhmWjYvoKnNihWZs6ploNQtFT45Jg9.Yytg-1744318117-1.2.1.1-kEx0r6Bi_jQ927fHFgGLSljRjsGwXijQ7hfaI1fBmF_HlwnEsDW5Js.TQHAo31jug4PJKmbfFFfjX_m1rRNfwf6GbIXkMlMEFiUqZpKxWsAHpyUuXMiTIVGx33utk_nEW.hNfBo_l_ADudMJK.bHViYUZDHIJF0nrwLdgthT5efiyI6TD6GqBJeHL0WSzejmAcb9cQxmjKklQrtGAzUlfnim8O4TyBg9S27_qr.k5JCM_C8ivwmkHffRfAyRIqT_nDeffUn6eOG77xTw1leY6UeqNiUMciqKNZI2AMg3SHgg5.jIovAyCk1X0o7pYOafVmfYcCpykmPyIotulKLS_6o6zjnBJvq8xWeGuDkx6cGAT1h6oc80_soiw.aFnwQjKkQKFt8oNV0semeItGXKS4lXhITst47RCXlmcYQBqD9MQIMkpPG8rJUW_sjWEN_whf6D44IwEgdIGKzUpA_HBVFI9kVarC9T62C3J4P_ktJFysSw8xv3vOUuWa6j62MweX4lZRp5t8m5ZIFWHWkeh0zPvcP.f0NtOZdj_DkP.fZgu2m9Htrry00Cl7edCxbQA7DcApyuPbdJjtexmnPStdRNDFvKpE6PnrtYJ_BmLJYiT15y9.0fgWLgK1HeYkjXlzHKLB75cdoWw58dIWqiHn.xSzJD8ESKexlpWYXbtZ8JKIJK_nzurL1RbOkwycB5f6Vxyqhhlj64OZlRDJoMj3tc0WGllaN1zam.vZa2SJLFXOlZW8B.lOIbiBhNMSGV7eWtWfSkfdKQSZoyoRcQRMYG4KseSZTXFkkLe2kOcANkmrNbaSpF7O1plIBK7fwvslLv9HqKYwuCZ2Ene2FsJkmcdwPCWWg4rzShHR_f79dQ7w5EXnUfXSOsHQL6yRwWsFAqCaNNmhh.vEmgoegnsizE6WzxnkDqVZ795jZWdT_xYt9SVdcHJLjjnhLcVxBWFlBa6R22HQTPpVi2XMIWAhRGJxUWfkf53mDZBYIT.IGrP1XV680CtJgbUlA0DwIHUH4ooRea4pZsyCdRAl40oyamoiyH1HY1o4VCc2nwTjoOFQf3ogrIF6gHLP0bLmJjGzmF4ms.8QJl4uwk_F5xB.Xsgs_l.d_UXnm68T0DUMjcAOrfRBRA098D8XB3xPXGLqbCmC8zeJdHvNvK5lWMcVKRHKm5Phn6lvUpoqjoYvhprbA_SaCvlfkV04YSzzc2OBWPR5kn6hZTbcAmivvti6pJ.OhyYmnF73xRT6IZqW6miD9vXdFxAHM4J0MMbAePEbmVef6uJb44rV5YvLnRI5LUrmYpijIBO4k4CJqiuQPYokjTYZl3qe9hcr1wbVTeYq1pGqJ3L0XgER89fWc17PG1QID9SJXpIB3sj4IfzXb6CQeZMkIp2146GoYz9VlJOHbaZ6XJVq5cxLo1Po12pMLb.N1wdB.uczH0d2slUpS.IRjKj6s0bUqOYmdG9pHE2CUUc2og9aYnKk3QGR2esom_I1.HlglHFDcdhz1tv9l5BkQucUfCUJMzvzGFdxdW1qiQPsIBLj4XxV1p0yyHGITY_rdxbG7oAIJTaqgjaQ6gTYJBJPc5Cu3djuratBdsHVgj5FhMEjr5VU.LwWc_d0bGMFiAo.rYtIGB43TkTBIvvnz8XjW3YFNFky6fmCk013DwNBzuVxU4MAYr7G20kaWOV8Kw9uYdlu8zrrj5jp5fJgZeo91fJyc0VLPnW7Ov7Cc9dRuIxYDMuQJha0WP5PKSltIvjOU_p8fd.54L8R_J67wpHNCXPxsEqAMdn49wPxDVqhstrt5_qyDP1XUICUQQMVrqFFcHMMqnJaTZP3tK_AOl..W6P27dolGtLuIf94xAjUGUGonYDrKq3_VBeaXTOfCKV6igjZc4MA0tUSYJoKYXWI9j76ll1CVXDtE88HlDaqXf4gcxy77CSbBOj9ZgZ.DD29uB2dja509ZJ_C15vKwFbDXifUzsmQXaippFFe1K5mBR53Cg1atYutSYZWB_lC5VpNqcXEjZQxvJFjP9G4__Hk8d7SC1PrTy81Wuls11JpRIjb4PNF_lMtkIQ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=92e51b2b7d093e3b';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, "\/0589.65031?__cf_chl_rt_tk=MxxUXQGjRnZgUjyZ1pQWxjM93nPohH6e0DC60B7qaZM-1744318117-1.0.1.1-GET1a2uwf.CwFVVYv_FqGScJyrMcvC78i40lUqgnfQ4" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>