<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> | |
<mrow> | |
<mi>E</mi> | |
<mi>i</mi> | |
<mfenced> | |
<mrow> | |
<mi>x</mi> | |
</mrow> | |
</mfenced> | |
<mo>=</mo> | |
<mo>−</mo> | |
<msub> | |
<mi>E</mi> | |
<mn>1</mn> | |
</msub> | |
<mfenced> | |
<mrow> | |
<mo>−</mo> | |
<mi>x</mi> | |
</mrow> | |
</mfenced> | |
<mo>=</mo> | |
<munderover> | |
<mo>∫</mo> | |
<mrow> | |
<mo>−</mo> | |
<mi>x</mi> | |
</mrow> | |
<mi>∞</mi> | |
</munderover> | |
<mfrac> | |
<mrow> | |
<msup> | |
<mi>e</mi> | |
<mrow> | |
<mo>−</mo> | |
<mi>t</mi> | |
</mrow> | |
</msup> | |
<mi>d</mi> | |
<mi>t</mi> | |
</mrow> | |
<mi>t</mi> | |
</mfrac> | |
</mrow> | |
</math> |