Marra

Brazil

Brazilian graduate student.

Aug
23
comment Why are germs of functions important?
I've come to realize that it works easier when working with holonomy groups (saving a lot of work by not having to deal with open subsets for a 'chain' of functions...) and also works great with sheaf theory...
Aug
19
awarded Supporter
Aug
19
awarded Scholar
Aug
19
accepted Is the phrase "There are many hungers it is better to deny than to feed" correct?
Aug
19
awarded Student
Aug
19
asked Is the phrase "There are many hungers it is better to deny than to feed" correct?
Aug
1
awarded Nice Answer
Jul
16
accepted On Stein manifolds and constant functions
Jul
16
comment On Stein manifolds and constant functions
Nice! Thank you.
Jul
16
asked On Stein manifolds and constant functions
Jul
10
comment Differential problem, how to get y''?
The one you already have, $\dfrac{dy}{dx} = \dfrac{-b^2x}{a^2y}$
Jul
10
comment Differential problem, how to get y''?
Differentiate on both sides the expression you have for the first derivative of $y$. You'll have an equation with a $\dfrac{dy}{dx}$. Just substitute the value you have for the first derivative. If you're having doubts on how to differentiate the quotient, check out the derivative properties, it's not hard.
Jul
2
awarded Inquisitive
Jul
2
awarded Curious
Jun
28
comment Show there exists a unique $f$ (in $\mathbb R^+$) such that $\frac{d}{dx}f(x)=f^{-1}(x)$
Try differentiating $f\circ f$.
Jun
26
accepted Can I construct an affine connection on a Riemannian manifold from arbitrary Christoffel Symbols?
Jun
26
asked Submersions define Foliations
Jun
20
comment do Carmo: near isolated zeros, killing field tangent to geodesic spheres
Could someone clarify this for me? What does $\dfrac{\partial}{\partial r_p}$ stands for? Thanks.
May
25
awarded Student
May
25
asked How is foliation of manifolds' theory useful in General Relativity?
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