ЛЛ Безкоровайная - Український математичний журнал, 2019 - umj.imath.kiev.ua
We establish a new criterion for the analyticity of a function w= u+ iv or w= u-iv, u (x, y), v (x,
y)\in C1 (G) in the domain G. It is expressed via the metric tensors of the surfaces Z= u and …