]> MathToWeb (MathML example)

MathML generated by MathToWeb
A MathML example displaying \underline.

e ‾ i = ∂ x k ∂ y i E ‾ k {\underline{e}}_{\, i} = \frac{\partial x^k}{\partial y^i} {\underline{E}}_{\, k} 


<math xmlns="http://www.w3.org/1998/Math/MathML">
<mrow>
	<msub>
		<mrow>
			<munder accentunder="true">
				<mi>e</mi>
				<mo stretchy="true">&OverBar;</mo>
			</munder>
		</mrow>
		<mrow>
			<mspace width="0.167 em" />
			<mi>i</mi>
		</mrow>
	</msub>
	<mo>=</mo>
	<mfrac linethickness="1">
		<mrow>
			<mo>&part;</mo>
			<msup>
				<mi>x</mi>
				<mi>k</mi>
			</msup>
		</mrow>
		<mrow>
			<mo>&part;</mo>
			<msup>
				<mi>y</mi>
				<mi>i</mi>
			</msup>
		</mrow>
	</mfrac>
	<msub>
		<mrow>
			<munder accentunder="true">
				<mi>E</mi>
				<mo stretchy="true">&OverBar;</mo>
			</munder>
		</mrow>
		<mrow>
			<mspace width="0.167 em" />
			<mi>k</mi>
		</mrow>
	</msub>
</mrow>
</math>

*Note:
You might notice that the above example uses the MathML character &OverBar; to represent an under-bar.
At the time of testing, &UnderBar; was not functioning and so &OverBar; was used in its place.