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Results tagged with reference-request
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user 64681
This tag is used if a reference is needed in a paper or textbook on a specific result.
2
votes
1
answer
256
views
Is there a name for this cardinal?
Let $X$ be a set and $\omega$ be a family of its subsets. Consider the family
$\mathcal{F}$ of subsets of $X$, such that any $A\in\mathcal{F}$ has a
non-empty intersection with each element of $\omega …
1
vote
0
answers
75
views
Estimation of the number of local extrema
I have a question about a simple proposition, I suppose that this is something
well-known or a special case of something well-known:
Let $D\subset\mathbb{R}^{2}$ be the closed unit disk in the plane …