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