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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.

3 votes
0 answers
47 views

Measure of set of vectors whose outer product are bounded

Let consider the canonical Euclidean space $E = \mathbb{R}^n$, endowed with the Lebesgue measure $\mu$. Define the map $v_k: E^k \rightarrow \mathbb{R}$ that sends a $k$-uple $x_1,\cdots, x_k$ of vec …
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1 vote
0 answers
60 views

Compatibility of the Hausdorff measure with short exact sequences in normed spaces

Let $(E,\|.\|)$ be a finite dimensional normed space and take $F\subset E$ a subpace, so that we have the canonical short exact sequence $0\rightarrow F\rightarrow^\iota E\rightarrow^\pi E/F\rightar …
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  • 313