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<p>this mail possibly only works in thunderbird but that is because it supports the relevant standards not because it is using any non standard extension it is standard html mail using html5's inclusion of mathml.</p>
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<p>inline math <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><msqrt><mrow><mo lspace="0em" rspace="0em">cos</mo><mo stretchy="false">(</mo><mi>θ</mi><mo stretchy="false">)</mo></mrow></msqrt><annotation encoding="TeX">\sqrt{\cos (\theta)}</annotation></semantics></math>
here</p>
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<p>and display</p>
<p><math display="block" xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo>(</mo><mtable displaystyle="false" rowspacing="0.5ex"><mtr><mtd><mn>1</mn></mtd><mtd><mn>2</mn></mtd></mtr><mtr><mtd><mn>3</mn></mtd><mtd><mn>4</mn></mtd></mtr></mtable><mo>)</mo></mrow><annotation encoding="TeX">\begin{pmatrix}
1& 2\\ 3 & 4\end{pmatrix}</annotation></semantics></math><br>
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