| <?xml version='1.0'?> |
| <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN' |
| 'http://www.w3.org/TR/MathML2/dtd/xhtml-math11-f.dtd' |
| [<!ENTITY mathml 'http://www.w3.org/1998/Math/MathML'>]> |
| <html xmlns='http://www.w3.org/1999/xhtml'> |
| <head><title>zeta9</title> |
| <!-- MathML created with MathCast Equation Editor version 0.89 --> |
| </head> |
| <body> |
| <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> |
| <mrow> |
| <mi>ζ</mi> |
| <mfenced> |
| <mrow> |
| <mn>2</mn> |
| <mi>n</mi> |
| </mrow> |
| </mfenced> |
| <mo>=</mo> |
| <mfrac> |
| <mrow> |
| <msup> |
| <mfenced> |
| <mrow> |
| <mo>−</mo> |
| <mn>1</mn> |
| </mrow> |
| </mfenced> |
| <mrow> |
| <mi>n</mi> |
| <mo>−</mo> |
| <mn>1</mn> |
| </mrow> |
| </msup> |
| <msup> |
| <mn>2</mn> |
| <mrow> |
| <mn>2</mn> |
| <mi>n</mi> |
| <mo>−</mo> |
| <mn>1</mn> |
| </mrow> |
| </msup> |
| <msup> |
| <mi>π</mi> |
| <mrow> |
| <mn>2</mn> |
| <mi>n</mi> |
| </mrow> |
| </msup> |
| </mrow> |
| <mrow> |
| <mfenced> |
| <mrow> |
| <mn>2</mn> |
| <mi>n</mi> |
| </mrow> |
| </mfenced> |
| <mo>!</mo> |
| </mrow> |
| </mfrac> |
| <msub> |
| <mi>B</mi> |
| <mrow> |
| <mn>2</mn> |
| <mi>n</mi> |
| </mrow> |
| </msub> |
| <mspace width="1em"/> |
| <mo>;</mo> |
| <mspace width="1em"/> |
| <mi>n</mi> |
| <mo>∈</mo> |
| <mi>ℕ</mi> |
| </mrow> |
| </math> |
| </body> |
| </html> |
