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Apr
15
comment Lower order perturbations of 2nd order differential operators
If this is question is about whether the operator is formally self-adjoint, you should be able to do the calculation yourself.
Mar
28
comment freedom in choosing a smooth function of compact support
This is not appropriate for this site. Besides have you tried this when $n=1$?
Feb
11
comment Flat vector bundles and constant transition functions
Well, it is a consequence of the first part. Did you figure it out on your own? Again the proof is similar to an analogous description of flat Riemannian manifolds.
Feb
11
comment Flat vector bundles and constant transition functions
In particular, you've probably learned that a Riemannian metric is flat iff its curvature vanishes. The proof is basically the same.
Feb
11
comment Flat vector bundles and constant transition functions
This site is for research level questions. One like yours is for me borderline but you should at least look for references elsewhere. Or try to prove it yourself. Here's the Wikipedia article: en.m.wikipedia.org/wiki/Flat_vector_bundle
Feb
6
comment definition of derivative of a vector field
It's fine but if $V$ is a vector field on $M$, $dV: T_*M \rightarrow T_*(T_*M)$ and it is often not what is needed in a specific situation.
Jan
3
comment Inverse of a matrix
Have you tried some low-dimensional cases with explicit values for $M$ and $N$?
Jun
20
comment What is name/references of inequality bounding sup-norm by $L_2$ norm (or a similar variant of this)?
For a finite dimensional space, this holds for any two norms. Just compare the unit balls.
Apr
27
answered Distributional/weak time derivative basic question
Dec
23
awarded  Supporter
Oct
31
awarded  Teacher
Oct
31
answered Explanation about frames as distinct from a co-ordinate system