You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
2.6 KiB
120 lines
2.6 KiB
<?xml version="1.0" encoding="utf-8"?>
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN" "http://www.w3.org/Math/DTD/mathml2/xhtml-math11-f.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
|
|
<title>Untitled</title>
|
|
</head>
|
|
<body>
|
|
<math xmlns="http://www.w3.org/1998/Math/MathML">
|
|
<mrow>
|
|
<mi>k</mi>
|
|
<mo>=</mo>
|
|
<mfrac>
|
|
<mrow>
|
|
<mfrac>
|
|
<mrow>
|
|
<msup>
|
|
<mo>∂</mo>
|
|
<mn>2</mn>
|
|
</msup>
|
|
<mi>z</mi>
|
|
</mrow>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<msup>
|
|
<mi>x</mi>
|
|
<mn>2</mn>
|
|
</msup>
|
|
</mrow>
|
|
</mfrac>
|
|
<mfrac>
|
|
<mrow>
|
|
<msup>
|
|
<mo>∂</mo>
|
|
<mn>2</mn>
|
|
</msup>
|
|
<mi>z</mi>
|
|
</mrow>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<msup>
|
|
<mi>y</mi>
|
|
<mn>2</mn>
|
|
</msup>
|
|
</mrow>
|
|
</mfrac>
|
|
<mo>-</mo>
|
|
<msup>
|
|
<mrow>
|
|
<mo>(</mo>
|
|
<mfrac>
|
|
<mrow>
|
|
<msup>
|
|
<mo>∂</mo>
|
|
<mn>2</mn>
|
|
</msup>
|
|
<mi>z</mi>
|
|
</mrow>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<mi>x</mi>
|
|
<mo>∂</mo>
|
|
<mi>y</mi>
|
|
</mrow>
|
|
</mfrac>
|
|
<mo>)</mo>
|
|
</mrow>
|
|
<mn>2</mn>
|
|
</msup>
|
|
</mrow>
|
|
<mrow>
|
|
<msup>
|
|
<mrow>
|
|
<mo>(</mo>
|
|
<mn>1</mn>
|
|
<mo>+</mo>
|
|
<msup>
|
|
<mrow>
|
|
<mo>(</mo>
|
|
<mfrac>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<mi>z</mi>
|
|
</mrow>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<mi>x</mi>
|
|
</mrow>
|
|
</mfrac>
|
|
<mo>)</mo>
|
|
</mrow>
|
|
<mn>2</mn>
|
|
</msup>
|
|
<mo>+</mo>
|
|
<msup>
|
|
<mrow>
|
|
<mo>(</mo>
|
|
<mfrac>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<mi>z</mi>
|
|
</mrow>
|
|
<mrow>
|
|
<mo>∂</mo>
|
|
<mi>y</mi>
|
|
</mrow>
|
|
</mfrac>
|
|
<mo>)</mo>
|
|
</mrow>
|
|
<mn>2</mn>
|
|
</msup>
|
|
<mo>)</mo>
|
|
</mrow>
|
|
<mn>2</mn>
|
|
</msup>
|
|
</mrow>
|
|
</mfrac>
|
|
</mrow>
|
|
</math>
|
|
</body>
|
|
</html>
|