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Results tagged with mg.metric-geometry
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user 38468
Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.
6
votes
Line-preserving bijection of ${\mathbb{R}}^n$ onto itself
Do you assume that $f$ is surjective? Else, $f(x,y)=(x^3+y,0)$ would send any line
to the $x$-axis.
- 5,186
3
votes
Three questions concerning lattice points on sphere surfaces
It is not really my area, but the answer to part 2 is that you are looking for the smallest $N$ such that there are exactly $8n-4$ ways of writing it in the form $a^2+b^2$.
If such $N$ is even but i …
- 5,186