<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> | |
<mrow> | |
<mi>ζ</mi> | |
<mfenced> | |
<mrow> | |
<mi>s</mi> | |
</mrow> | |
</mfenced> | |
<mspace width="1em"/> | |
<mo>=</mo> | |
<mspace width="1em"/> | |
<munderover> | |
<mo>∑</mo> | |
<mrow> | |
<mi>k</mi> | |
<mo>=</mo> | |
<mn>1</mn> | |
</mrow> | |
<mi>∞</mi> | |
</munderover> | |
<mfrac> | |
<mn>1</mn> | |
<msup> | |
<mi>k</mi> | |
<mi>s</mi> | |
</msup> | |
</mfrac> | |
</mrow> | |
</math> |