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Math student, interested in mathematical computing, fluid dynamic, computer graphics.


6h
comment Understanding the Definition of the Tensor Product of Chain Complexes
This is just simple example of tensor product between two very simple simplicial complexes.
6h
comment Understanding the Definition of the Tensor Product of Chain Complexes
Is that enough?
6h
revised Understanding the Definition of the Tensor Product of Chain Complexes
added 298 characters in body
7h
answered Understanding the Definition of the Tensor Product of Chain Complexes
7h
comment Understanding the Definition of the Tensor Product of Chain Complexes
Using $d$ for differential and for element of $D$ is very confusing. Could you alter your notation in your answer?
7h
answered Fundamental group of sphere with two holes
Dec
15
comment Is a line just an infinitely large circle?
Isn't this question victim of hat hunting :D ?
Dec
15
comment Prove spatial velocity identity - screw theory
I modified my answer. I tried to explain body and spatial velocity just for rotations. Where it is quite clear what it means. I'm not that familiar with screw motions, but they have to work similar way, because the math do.
Dec
15
revised Prove spatial velocity identity - screw theory
added 1196 characters in body
Dec
15
comment Prove spatial velocity identity - screw theory
@JDS How much are you familiar with Lie groups and lie algebras? So I know how much jargon I can use and not to confuse you? Are you ok with groups $SO(3),SE(3)$, algebras $so(3),se(3)$, exponential map(in the context of lie group!) etc.?
Dec
15
comment Prove spatial velocity identity - screw theory
So $V^b_{bc}$ does not refer to the frame $B$ neither $C$. It is velocity(in body frame) of body undergoing screw motion $g_{bc}$.
Dec
15
comment Prove spatial velocity identity - screw theory
Right now I do not know how to explain properly body and spatial frame. But $A,B,C$ are just some frames and $g_{ab}$ is screw motion between $A,B$, $V_{ab}$ is "velocity" of hypothetical body undergoing screw motion $g_{ab}$ and the "velocity" can be given in spatial frame $V^s_{ab}$ or in body frame $V^b_{ab}$ of that hypothetical body.
Dec
14
revised Are the polynomial functions on $S^1$ dense in $C(S^1,ℂ)$?
added 135 characters in body
Dec
14
revised Are the polynomial functions on $S^1$ dense in $C(S^1,ℂ)$?
added 32 characters in body
Dec
14
answered Are the polynomial functions on $S^1$ dense in $C(S^1,ℂ)$?
Dec
14
comment what is the smallest number $n\in \mathbb N$ such that $A^n=I$?
@iou Welcome to MSE unfortunately for you, asking homework(test) questions without showing your effort at solving them is discouraged here. For example it is discussed here meta.math.stackexchange.com/questions/1803/…
Dec
14
comment what is the smallest number $n\in \mathbb N$ such that $A^n=I$?
@Galc127 And how does that help? It is rotation matrix, so it has determinant equal to one.
Dec
14
comment what is the smallest number $n\in \mathbb N$ such that $A^n=I$?
@GDumphart That is the reason why I downvoted both.
Dec
13
comment To find a measurable subset with arbitraray measure
$m$ is Lebesque measure right? Because if it is not, than such $A$ does not have to exist.
Dec
12
answered Prove spatial velocity identity - screw theory