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visits member for 2 years, 1 month
seen Nov 5 '13 at 17:17

Mar
2
awarded  Yearling
Nov
12
awarded  Tumbleweed
Nov
5
asked Prove that $f$ is smooth if $x f$, $y f$ are smooth
Aug
15
accepted Is this expression for the Riemann Tensor correct?
Aug
15
comment Is this expression for the Riemann Tensor correct?
The c's and the p's are smooth functions on the manifold
Aug
15
asked Is this expression for the Riemann Tensor correct?
Aug
15
accepted What does this notation means in noncommutative case
Aug
14
comment What does this notation means in noncommutative case
But in the page en.wikipedia.org/wiki/Covariant_derivative#Formal_definition they use the notation $V f$ also to indicate the directional derivative of a function along $V$. Then it is misleading to choose one or the other alternative above. How should I interprete?
Aug
14
asked What does this notation means in noncommutative case
Mar
2
awarded  Yearling
Feb
4
accepted Find all the functions which satisfy a given functional equation
Feb
2
revised Find all the functions which satisfy a given functional equation
edited body
Feb
2
comment Find all the functions which satisfy a given functional equation
@DejanGovc I was editing while I received your post. Please check it again
Feb
2
revised Find all the functions which satisfy a given functional equation
added 123 characters in body
Feb
2
comment Find all the functions which satisfy a given functional equation
@Alex did you assume $f(0)=0$ in your solution? Because then I'm pretty sure that $f(0)=-1$ is also possible. My apologies since I inverted $x,y$ in the first term of the equation. Please check the edited version. Still my apologies. BTW in this case setting $x=y=0$ gives $f(f(0))=f(0)^2+f(f(0))+f(0)$ from which $f(0)\in \{-1,0\}$.
Feb
2
asked Find all the functions which satisfy a given functional equation
Dec
5
asked Unusual Compact Embeddings
Nov
13
asked solution of Lagrange differential equation are square integrable
Nov
5
revised Ordering of two weak star limits
added 492 characters in body
Nov
5
comment Ordering of two weak star limits
lol you are right...