Kobayashi-Royden pseudometric vs. Lempert function
arXiv:0911.5071
Abstract
We give an example showing that the Kobayashi-Royden pseudometric for a non-taut domain is, in general, not the derivative of the Lempert function.
An essential mistake has been corrected in v2. Improved example in v3. v4: minor changes according to the referee remarks (Ann. Mat. Pura Appl.)