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Apr
21
awarded  Autobiographer
Apr
8
awarded  Favorite Question
Mar
19
accepted Is it legal to write $A_\mu = (a, b, c, d)$?
Mar
5
comment Why is $1 - \frac{1}{1 - \frac{1}{1 - \ldots}}$ not real?
A comment to the last paragraph (below the rule): Also $\lim_{n\to \infty} \sum_{i=0}^n \frac{1}{n!} = \mathrm e \not\in \mathbb Q$, even though it is just the addition of rational numbers. The connection is the limit to infinity, I think.
Nov
6
revised Is a matrix multiplied with its transpose something special?
Use non-italic transpose symbol
Sep
20
awarded  Yearling
May
11
comment Why the name 'FACTORIAL'?
@Jens: I think that it only used by people who do not know the correct English word for it and use it because it sounds English and is close to the German word.
Apr
18
awarded  Popular Question
Oct
10
awarded  Popular Question
Aug
5
awarded  Yearling
Jul
2
awarded  Curious
May
30
comment Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$?
Ah, the inverse function theorem holds in general if it is invertible. Good to know!
May
30
accepted Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$?
May
29
revised Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$?
Add duplicate
May
29
asked Is $\dot u/\dot \phi$ is the same as $\mathrm du / \mathrm d\phi$?
May
8
comment Two halls 6 and 9 meters perpendicularly intersect. Optimization
@user2171981 I guess you should be able to carry it around the corner.
May
8
asked Chain rule for tensor of family of tensor fields
Mar
21
comment Why do we require radians in calculus?
In Physics, radians are unitless, but sometimes still mentioned. Just like counts/s or something like that. I think it is good to make it explicit.
Feb
27
awarded  Good Question
Feb
3
asked Closed complex integral that does not vanish