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I am an undergraduate.


22h
comment Changing a basis and satisfying inequalities
Ah, I now realize you must be very careful with each step...
Dec
11
comment What is a covector and what is it used for?
yes, so $dx([1,2])$ would be the function $dx$ acting on the vector $[1,2] \in R^2$.
Dec
4
comment How would you define a geodesic in $\operatorname{SO}(2n)$ and $\operatorname{SO}(2n+1)$?
Thank you for the answer. In $R^{n^2}$, do we compute the Euclidean distance as if the matrix was a long vector, adding up the squares of the components and taking a square root?
Dec
3
comment What is the diameter of a manifold?
@QiaochuYuan, it was a question unattached to a textbook, just "What are the intrinsic diameters of SO(2n) and SO(2n+1)?" The textbook we have been using is Frank Morgan's "Riemannian Geometry". My professor probably assumed that the choice of metric would be immediately obvious, but it is not, at least to me.
Dec
3
comment What is the diameter of a manifold?
@QiaochuYuan does changing it to "intrinsic diameter" change anything?
Nov
19
comment What is a covector and what is it used for?
Yes, I think most of my misunderstanding arose from the fact that I was interpreting $dx$ as a "length" as opposed to a function.