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51 lines
955 B
Plaintext
51 lines
955 B
Plaintext
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<math display="block">
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<mrow>
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<mrow>
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<mo>(</mo>
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<mfrac>
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<msup>
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<mo>∂</mo>
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<mn>2</mn>
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</msup>
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<mrow>
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<mo>∂</mo>
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<msup>
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<mi>x</mi>
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<mn>2</mn>
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</msup>
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</mrow>
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</mfrac>
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<mo>+</mo>
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<mfrac>
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<msup>
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<mo>∂</mo>
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<mn>2</mn>
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</msup>
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<mrow>
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<mo>∂</mo>
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<msup>
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<mi>y</mi>
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<mn>2</mn>
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</msup>
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</mrow>
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</mfrac>
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<mo>)</mo>
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</mrow>
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<msup>
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<mrow>
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<mo minsize="150%">|</mo>
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<mi>φ</mi>
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<mo stretchy="false">(</mo>
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<mi>x</mi>
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<mo>+</mo>
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<mi mathvariant="normal">i</mi>
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<mi>y</mi>
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<mo stretchy="false">)</mo>
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<mo minsize="150%">|</mo>
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</mrow>
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<mn>2</mn>
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</msup>
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<mo>=</mo>
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<mn>0</mn>
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</mrow>
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</math>
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