<math xmlns='http://www.w3.org/1998/Math/MathML'><semantics><mrow xref='id21'><mrow xref='id19'><mrow xref='id13'><mrow xref='id3'><mi xref='id1'>u</mi><mo>⁡</mo><mfenced><mi xref='id2'>n</mi></mfenced></mrow><mo>⁢</mo><mfenced><mrow xref='id12'><mrow><mo>-</mo><mrow xref='id6'><msup><mi xref='id4'>ν</mi><mn xref='id5'>2</mn></msup></mrow></mrow><mo>+</mo><mrow xref='id11'><msup><mfenced><mrow xref='id9'><mi xref='id7'>ν</mi><mo>+</mo><mi xref='id8'>n</mi></mrow></mfenced><mn xref='id10'>2</mn></msup></mrow></mrow></mfenced></mrow><mo>+</mo><mrow xref='id18'><mi xref='id14'>u</mi><mo>⁡</mo><mfenced><mrow xref='id17'><mi xref='id15'>n</mi><mo>-</mo><mn xref='id16'>2</mn></mrow></mfenced></mrow></mrow><mo>=</mo><mn xref='id20'>0</mn></mrow><annotation-xml encoding='MathML-Content'><apply id='id21'><eq/><apply id='id19'><plus/><apply id='id13'><times/><apply id='id3'><ci id='id1'>u</ci><ci id='id2'>n</ci></apply><apply id='id12'><plus/><apply><minus/><apply id='id6'><power/><ci id='id4'>nu</ci><cn id='id5' type='integer'>2</cn></apply></apply><apply id='id11'><power/><apply id='id9'><plus/><ci id='id7'>nu</ci><ci id='id8'>n</ci></apply><cn id='id10' type='integer'>2</cn></apply></apply></apply><apply id='id18'><ci id='id14'>u</ci><apply id='id17'><minus/><ci id='id15'>n</ci><cn id='id16' type='integer'>2</cn></apply></apply></apply><cn id='id20' type='integer'>0</cn></apply></annotation-xml><annotation encoding='Maple'>u(n)*(-nu^2+(nu+n)^2)+u(n-2) = 0</annotation></semantics></math>