ag-gipp/GoUldI

<math 
  xmlns="http://www.w3.org/1998/Math/MathML" display="block" alttext="d f equals StartFraction partial-differential f Over partial-differential x EndFraction d x plus StartFraction partial-differential f Over partial-differential y EndFraction d y equals p d x plus v d y">
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                  <!-- ∂ -->
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                <mi mathvariant="normal" data-semantic-type="prefixop" data-semantic-role="prefix function" data-semantic-font="normal" data-semantic-id="7" data-semantic-parent="10">∂
                  <!-- ∂ -->
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                <mo data-semantic-type="punctuation" data-semantic-role="application" data-semantic-id="9" data-semantic-parent="10" data-semantic-added="true" data-semantic-operator="appl">⁡</mo>
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          <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="13" data-semantic-parent="38">x</mi>
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        <mo data-semantic-type="operator" data-semantic-role="addition" data-semantic-id="14" data-semantic-parent="42" data-semantic-operator="infixop,+">+</mo>
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                <mi mathvariant="normal" data-semantic-type="prefixop" data-semantic-role="prefix function" data-semantic-font="normal" data-semantic-id="15" data-semantic-parent="18">∂
                  <!-- ∂ -->
                </mi>
                <mo data-semantic-type="punctuation" data-semantic-role="application" data-semantic-id="17" data-semantic-parent="18" data-semantic-added="true" data-semantic-operator="appl">⁡</mo>
                <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="16" data-semantic-parent="18">f</mi>
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                <mi mathvariant="normal" data-semantic-type="prefixop" data-semantic-role="prefix function" data-semantic-font="normal" data-semantic-id="19" data-semantic-parent="22">∂
                  <!-- ∂ -->
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                <mo data-semantic-type="punctuation" data-semantic-role="application" data-semantic-id="21" data-semantic-parent="22" data-semantic-added="true" data-semantic-operator="appl">⁡</mo>
                <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="20" data-semantic-parent="22">y</mi>
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          <mo data-semantic-type="operator" data-semantic-role="multiplication" data-semantic-id="40" data-semantic-parent="41" data-semantic-added="true" data-semantic-operator="infixop,⁢">⁢</mo>
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          <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="28" data-semantic-parent="45">d</mi>
          <mo data-semantic-type="operator" data-semantic-role="multiplication" data-semantic-id="44" data-semantic-parent="45" data-semantic-added="true" data-semantic-operator="infixop,⁢">⁢</mo>
          <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="29" data-semantic-parent="45">x</mi>
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        <mo data-semantic-type="operator" data-semantic-role="addition" data-semantic-id="30" data-semantic-parent="49" data-semantic-operator="infixop,+">+</mo>
        <mrow data-semantic-type="infixop" data-semantic-role="implicit" data-semantic-id="48" data-semantic-children="31,32,33" data-semantic-content="46,47" data-semantic-parent="49">
          <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="31" data-semantic-parent="48">v</mi>
          <mo data-semantic-type="operator" data-semantic-role="multiplication" data-semantic-id="46" data-semantic-parent="48" data-semantic-added="true" data-semantic-operator="infixop,⁢">⁢</mo>
          <mi data-semantic-type="identifier" data-semantic-role="latinletter" data-semantic-font="italic" data-semantic-id="32" data-semantic-parent="48">d</mi>
          <mo data-semantic-type="operator" data-semantic-role="multiplication" data-semantic-id="47" data-semantic-parent="48" data-semantic-added="true" data-semantic-operator="infixop,⁢">⁢</mo>
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    <annotation encoding="application/x-tex">df={\partial f \over \partial x}dx+{\partial f \over \partial y}dy=pdx+vdy</annotation>
  </semantics>
</math>