<math xmlns='http://www.w3.org/1998/Math/MathML'><semantics><mrow xref='id33'><mrow xref='id31'><mrow xref='id12'><mfenced><mrow xref='id8'><mrow xref='id4'><mo>-</mo><mrow xref='id3'><msup><mi xref='id1'>x</mi><mn xref='id2'>2</mn></msup></mrow></mrow><mo>-</mo><mrow xref='id7'><msup><mi xref='id5'>ν</mi><mn xref='id6'>2</mn></msup></mrow></mrow></mfenced><mo>⁢</mo><mrow xref='id11'><mi xref='id9'>y</mi><mo>⁡</mo><mfenced><mi xref='id10'>x</mi></mfenced></mrow></mrow><mo>+</mo><mrow xref='id19'><mi xref='id13'>x</mi><mo>⁢</mo><mfenced><mrow xref='id18'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id14'>x</mi></mrow></mfrac><mrow xref='id17'><mi xref='id15'>y</mi><mo>⁡</mo><mfenced><mi xref='id16'>x</mi></mfenced></mrow></mrow></mfenced></mrow><mo>+</mo><mrow xref='id30'><mrow xref='id22'><msup><mi xref='id20'>x</mi><mn xref='id21'>2</mn></msup></mrow><mo>⁢</mo><mfenced><mrow xref='id29'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id23'>x</mi></mrow></mfrac><mrow xref='id28'><mfrac><mo>ⅆ</mo><mrow><mo>ⅆ</mo><mi xref='id24'>x</mi></mrow></mfrac><mrow xref='id27'><mi xref='id25'>y</mi><mo>⁡</mo><mfenced><mi xref='id26'>x</mi></mfenced></mrow></mrow></mrow></mfenced></mrow></mrow><mo>=</mo><mn xref='id32'>0</mn></mrow><annotation-xml encoding='MathML-Content'><apply id='id33'><eq/><apply id='id31'><plus/><apply id='id12'><times/><apply id='id8'><minus/><apply id='id4'><minus/><apply id='id3'><power/><ci id='id1'>x</ci><cn id='id2' type='integer'>2</cn></apply></apply><apply id='id7'><power/><ci id='id5'>nu</ci><cn id='id6' type='integer'>2</cn></apply></apply><apply id='id11'><ci id='id9'>y</ci><ci id='id10'>x</ci></apply></apply><apply id='id19'><times/><ci id='id13'>x</ci><apply id='id18'><diff/><bvar><ci id='id14'>x</ci></bvar><apply id='id17'><ci id='id15'>y</ci><ci id='id16'>x</ci></apply></apply></apply><apply id='id30'><times/><apply id='id22'><power/><ci id='id20'>x</ci><cn id='id21' type='integer'>2</cn></apply><apply id='id29'><diff/><bvar><ci id='id23'>x</ci></bvar><apply id='id28'><diff/><bvar><ci id='id24'>x</ci></bvar><apply id='id27'><ci id='id25'>y</ci><ci id='id26'>x</ci></apply></apply></apply></apply></apply><cn id='id32' type='integer'>0</cn></apply></annotation-xml><annotation encoding='Maple'>(-x^2-nu^2)*y(x)+x*diff(y(x),x)+x^2*diff(diff(y(x),x),x) = 0</annotation></semantics></math>