1<?xml version='1.0'?> 2<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN' 3 'http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd' 4 [<!ENTITY mathml 'http://www.w3.org/1998/Math/MathML'>]> 5<html xmlns='http://www.w3.org/1999/xhtml'> 6<head><title>zeta9</title> 7<!-- MathML created with MathCast Equation Editor version 0.89 --> 8</head> 9<body> 10<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> 11 <mrow> 12 <mi>ζ</mi> 13 <mfenced> 14 <mrow> 15 <mn>2</mn> 16 <mi>n</mi> 17 </mrow> 18 </mfenced> 19 <mo>=</mo> 20 <mfrac> 21 <mrow> 22 <msup> 23 <mfenced> 24 <mrow> 25 <mo>−</mo> 26 <mn>1</mn> 27 </mrow> 28 </mfenced> 29 <mrow> 30 <mi>n</mi> 31 <mo>−</mo> 32 <mn>1</mn> 33 </mrow> 34 </msup> 35 <msup> 36 <mn>2</mn> 37 <mrow> 38 <mn>2</mn> 39 <mi>n</mi> 40 <mo>−</mo> 41 <mn>1</mn> 42 </mrow> 43 </msup> 44 <msup> 45 <mi>π</mi> 46 <mrow> 47 <mn>2</mn> 48 <mi>n</mi> 49 </mrow> 50 </msup> 51 </mrow> 52 <mrow> 53 <mfenced> 54 <mrow> 55 <mn>2</mn> 56 <mi>n</mi> 57 </mrow> 58 </mfenced> 59 <mo>!</mo> 60 </mrow> 61 </mfrac> 62 <msub> 63 <mi>B</mi> 64 <mrow> 65 <mn>2</mn> 66 <mi>n</mi> 67 </mrow> 68 </msub> 69 <mspace width="1em"/> 70 <mo>;</mo> 71 <mspace width="1em"/> 72 <mi>n</mi> 73 <mo>∈</mo> 74 <mi>ℕ</mi> 75 </mrow> 76</math> 77</body> 78</html>