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Yojito
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May
6
asked
Example of a function $f:\mathbb{R}^2\to\mathbb{R}$ not differentiable at $(0,0)$, but has a directional derivative at $(0,0)$ in all directions
May
6
asked
Express the Laplacian of $u \ldots ∂$
Apr
10
asked
Is $f$ surjective?
Apr
10
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Student
Apr
10
asked
Show that the set of functions $\mathbb{N}\to\{0,1\}$ is not countable
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