1,453 reputation
915
bio website
location
age
visits member for 3 years, 10 months
seen Sep 10 at 20:23

Mar
7
comment Which formula do I use to integrate $ \int {\sqrt{x^2 + 81} \over 2} \,dx $
In your final expression, the variable $x$ appears outside the integral, without any proper definition there. You should change this notation.
Mar
1
comment First-order derivatives in differential forms calculus
Because that is the way the Lie differential is defined.
Feb
26
awarded  Taxonomist
Feb
22
comment What is the theory of non-linear forms (as contrasted to the theory of differential forms)?
I guess these non-linear forms are taken from David Bachmann's book "A Geometric Approach to Differential Forms", aren't they?
Feb
22
revised First-order derivatives in differential forms calculus
added 75 characters in body
Feb
22
asked First-order derivatives in differential forms calculus
Feb
8
asked Solve commutator relation $[Q,d]=-[P,d]$ for $Q$ on chain complexes with scalar product
Jan
8
comment Alternating forms tangential to a subspace.
Corrected. Yes, thanks.
Jan
8
revised Alternating forms tangential to a subspace.
deleted 4 characters in body
Jan
8
asked Alternating forms tangential to a subspace.
Jan
6
comment Nonexistence of a certain norm on $C[0,1]$
Errr... why does $\|\cdot\|_\ast = \|\cdot\|_C$ not fulfill the assumption?
Dec
11
comment Tempered Distribution Calculation
Is there some Stieltjes-integral involved?
Dec
11
comment Stable and efficient projection onto subspace along another subspace
Actually, if I don't err, you do not even need to use Gram-Schmidth for $W$, as the new scalar product as constructed in the original post has been constructed to serve that way. Of course, we can normalize $w_i$ in advance with respect to that product, but that does not improve that substantially. (I think)
Dec
11
asked Stable and efficient projection onto subspace along another subspace
Dec
4
comment How can I compare unbounded linear operators?
Any bounded operator is called unbounded, too, which is completely common, isn't it?
Dec
3
asked How can I compare unbounded linear operators?
Dec
1
answered Projection operator and closed subspaces
Nov
30
revised Well-posedness of the Poisson problem with mixed boundary conditions
additional reference and motivation
Nov
27
comment Can you deduce Neumann boundary data from Dirichlet boundary data?
which, btw, tells about us that we cannot impose Neumann and Dirichlet boundary conditions simultaniously.
Nov
26
asked Well-posedness of the Poisson problem with mixed boundary conditions