Under the condition that the unit ball has sufficiently many extreme points, every 2-local nonlinear surjective isometry on a normed space is affine.
A generalization of the Kowalski -S\{l} odkowski theorem and its application to 2-local maps on function spaces
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abstract
In this paper, we extend a spherical variant of the Kowalski-S\{l}odkowski theorem due to Li, Peralta, Wang and Wang. As a corollary, we prove that every 2-local map in the set of all surjective isometries (without assuming linearity) on a certain function space is in fact a surjective isometry. This gives an affirmative answer to the problem on 2-local isometries posed by Moln\'ar.
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On 2-local nonlinear surjective isometries on normed spaces and C$^*$-algebras
Under the condition that the unit ball has sufficiently many extreme points, every 2-local nonlinear surjective isometry on a normed space is affine.