<?xml version="1.0"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" 
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  <!ENTITY mathml "http://www.w3.org/1998/Math/MathML">
]>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  <title>Maxwell's Equations</title>
</head>

<body style="background-color: #ffffff">
<h2>Maxwell's Equations</h2>

<p style="text-align:center">
<math xmlns='&mathml;'>
  <mstyle displaystyle='true'>
    <mrow>
      <mo>&lbrace;</mo>
      <mtable columnalign='right center left' equalrows='false' equalcolumns='false'>
        <mtr>
          <mtd>
            <mrow>
              <mo>&nabla;</mo>
              <mo>&times;</mo>
              <mover accent='true'>
                <mi mathvariant='bold'>B</mi>
                <mo stretchy='true'>&RightArrow;</mo>
              </mover>
              <mo>-</mo>
              <mfrac>
                <mn>1</mn>
                <mi>c</mi>
              </mfrac>
              <mfrac>
                <mrow>
                  <mo>&PartialD;</mo>
                  <mover accent='true'>
                    <mi mathvariant='bold'>E</mi>
                    <mo stretchy='true'>&RightArrow;</mo>
                  </mover>
                </mrow>
                <mrow>
                  <mo>&PartialD;</mo>
                  <mi>t</mi>
                </mrow>
              </mfrac>
            </mrow>
          </mtd>
          <mtd>
            <mo>=</mo>
          </mtd>
          <mtd>
            <mrow>
              <mfrac>
                <mrow>
                  <mn>4</mn>
                  <mi>&pi;</mi>
                </mrow>
                <mi>c</mi>
              </mfrac>
              <mover accent='true'>
                <mi mathvariant='bold'>j</mi>
                <mo stretchy='true'>&RightArrow;</mo>
              </mover>
            </mrow>
          </mtd>
        </mtr>
        <mtr>
          <mtd>
            <mrow>
              <mo>&nabla;</mo>
              <mo>&cdot;</mo>
              <mover accent='true'>
                <mi mathvariant='bold'>E</mi>
                <mo stretchy='true'>&RightArrow;</mo>
              </mover>
            </mrow>
          </mtd>
          <mtd>
            <mo>=</mo>
          </mtd>
          <mtd>
            <mrow>
              <mn>4</mn>
              <mi>&pi;</mi>
              <mi>&rho;</mi>
            </mrow>
          </mtd>
        </mtr>
        <mtr>
          <mtd>
            <mrow>
              <mo>&nabla;</mo>
              <mo>&times;</mo>
              <mover accent='true'>
                <mi mathvariant='bold'>E</mi>
                <mo stretchy='true'>&RightArrow;</mo>
              </mover>
              <mo>+</mo>
              <mfrac>
                <mn>1</mn>
                <mi>c</mi>
              </mfrac>
              <mfrac>
                <mrow>
                  <mo>&PartialD;</mo>
                  <mover accent='true'>
                    <mi mathvariant='bold'>B</mi>
                    <mo stretchy='true'>&RightArrow;</mo>
                  </mover>
                </mrow>
                <mrow>
                  <mo>&PartialD;</mo>
                  <mi>t</mi>
                </mrow>
              </mfrac>
            </mrow>
          </mtd>
          <mtd>
            <mo>=</mo>
          </mtd>
          <mtd>
            <mover accent='true'>
              <mn mathvariant='bold'>0</mn>
              <mo stretchy='true'>&RightArrow;</mo>
            </mover>
          </mtd>
        </mtr>
        <mtr>
          <mtd>
            <mrow>
              <mo>&nabla;</mo>
              <mo>&cdot;</mo>
              <mover accent='true'>
                <mi mathvariant='bold'>B</mi>
                <mo stretchy='true'>&RightArrow;</mo>
              </mover>
            </mrow>
          </mtd>
          <mtd>
            <mo>=</mo>
          </mtd>
          <mtd>
            <mn>0</mn>
          </mtd>
        </mtr>
      </mtable>
    </mrow>
  </mstyle>
</math>
</p>

<h2>Einstein's field equations</h2>

<p style="text-align:center">
<math xmlns='&mathml;'>
  <mstyle displaystyle='true'>
    <mrow>
      <msub>
        <mi mathvariant="normal">R</mi>
        <mstyle scriptlevel='1'>
          <mrow>
            <mi>&mu;</mi>
            <mi>&nu;</mi>
          </mrow>
        </mstyle>
      </msub>
      <mo>-</mo>
      <mfrac>
        <mn>1</mn>
        <mn>2</mn>
      </mfrac>
      <msub> 
        <mi>g</mi>
        <mstyle scriptlevel='1'>
          <mrow>
            <mi>&mu;</mi>
            <mi>&nu;</mi>
          </mrow>
        </mstyle>
      </msub>
      <mi mathvariant='normal'>R</mi>
      <mo>=</mo>
      <mfrac>
        <mrow>
          <mn>8</mn>
          <mi>&pi;</mi>
          <mi mathvariant='normal'>G</mi>
        </mrow>
        <msup>
          <mi>c</mi>
          <mn>4</mn>
        </msup>
      </mfrac>
      <msub>
        <mi mathvariant='normal'>T</mi>
        <mstyle scriptlevel='1'>
          <mrow>
            <mi>&mu;</mi>
            <mi>&nu;</mi>
          </mrow>
        </mstyle>
      </msub>
    </mrow>
  </mstyle>
</math>
</p>

</body>
</html>
