The group of continuous equivalence transforms for Guéant — Pu models the price indifference a call option in absence permanent market impact was obtained by L. V. Ovsyannikov's methods. It used search Lie equation with linear free element.

The method of object symmetry (Mardia et al. 2000) has been elaborated for the studies of shape variation in structures that have an internal plane of bilateral symmetry (e.g. vertebrate skulls and insect bodies). Further work related object symmetry to the structure of the shape tangent space (Kolamunnage & Kent 2003, 2005). For instance, principal component analysis (PCA) can separate a compo...

This Special Issue of Symmetry is devoted to recent advances in the nonlinear analysis and its applications [...]