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>digamma5</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>ψ</mi> 13 <mfenced> 14 <mrow> 15 <mfrac> 16 <mn>1</mn> 17 <mn>2</mn> 18 </mfrac> 19 <mo>−</mo> 20 <mi>n</mi> 21 </mrow> 22 </mfenced> 23 <mo>=</mo> 24 <munderover> 25 <mo>∑</mo> 26 <mrow> 27 <mi>k</mi> 28 <mo>=</mo> 29 <mn>1</mn> 30 </mrow> 31 <mrow> 32 <mi>n</mi> 33 <mo>−</mo> 34 <mn>1</mn> 35 </mrow> 36 </munderover> 37 <mfrac> 38 <mn>1</mn> 39 <mi>k</mi> 40 </mfrac> 41 <mo>+</mo> 42 <munderover> 43 <mo>∑</mo> 44 <mrow> 45 <mi>k</mi> 46 <mo>=</mo> 47 <mi>n</mi> 48 </mrow> 49 <mrow> 50 <mn>2</mn> 51 <mi>n</mi> 52 <mo>−</mo> 53 <mn>1</mn> 54 </mrow> 55 </munderover> 56 <mfrac> 57 <mn>2</mn> 58 <mi>k</mi> 59 </mfrac> 60 <mo>−</mo> 61 <mi>log</mi> 62 <mfenced> 63 <mrow> 64 <mn>4</mn> 65 </mrow> 66 </mfenced> 67 <mo>−</mo> 68 <mi>γ</mi> 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>