>
            </p>
        <div class="informalequation">
          <math overflow="scroll">

                <mrow>
                    <msub><mi mathvariant="italic">y</mi>
                    <mi mathvariant="italic">w</mi>
                    </msub>
                    <mo>=</mo>
                    <mrow>
                        <mfenced open="(" close=")">
                            <mrow>
                                <msub><mi mathvariant="italic">y</mi>
                                <mi mathv