Group Classification of Equations of the Form y″ = f(x,y)
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- Ovsyannikov, L.V. Journal of Applied Mechanics and Technical Physics (2004) 45: 153. doi:10.1023/B:JAMT.0000017576.56850.8d
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The problem of classification of ordinary differential equations of the form y″ = f(x,y) by admissible local Lie groups of transformations is solved. “Standard” equations are listed on the basis of the equivalence concept. The classes of equations admitting a one‐parameter group and obtained from the “standard” equations by invariant extension are described.