Abstract
Smoothness conditions on a function $f:\mathbb{R}^{2}\rightarrow \mathbb{R}$ that are weaker than being differentiable or Lipschitz at a point are defined and studied.
Citation
J. Marshall Ash. Stefan Catoiu. "Directional Differentiability in the Euclidean Plane." Real Anal. Exchange 42 (1) 185 - 192, 2017.
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