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17h
comment Differential algebra and differential-algebraic equations
Thomas Klimpel, am I reading your profile correctly if I read that you have done research on the relation between the structural properties of DAEs and symmetries? That sounds fascinating, any tips where I can read more about it?
2d
revised Differential algebra and differential-algebraic equations
deleted 4 characters in body
Aug
29
comment Retrieve the value of x,z and x
If you could link to this calculation maybe we can understand what you are asking and explain the process to you.
Aug
29
comment Retrieve the value of x,z and x
You want to do something to do the matrix in order to get $x,y,z$? That is impossible, since there are no equations involved.
Aug
29
comment Retrieve the value of x,z and x
@HelloWorld, the problem here is that we do not understand what you want explained. What do you want to know? Where did the matrix $A$ come from? What do you want to do with it? Is it involved in an equation somehow?
Aug
29
comment Retrieve the value of x,z and x
What are the original equations?
Aug
28
comment Border rank of tensors
Well, I think the rank is 6 and the border rank is 5.
Aug
28
comment Border rank of tensors
Is this for multiplication of triangular matrices? A little more context would be nice.
Aug
27
reviewed Leave Open Perfect numbers
Aug
27
reviewed Leave Open parameterizing two points along a circular path
Aug
27
reviewed Leave Open Prove that: 1. $gcd(a,b)=lcm(a,b)$ iff $|a|=|b|$ 2. $k>0\implies lcm(ka,kb)=k lcm(a,bk)$ 3. $a\mid m, b\mid m$, then $lcm(a,b)\mid m$
Aug
27
reviewed Leave Open A Problem for Nil-Ideals
Aug
27
reviewed Leave Open real analysis olympiad question
Aug
27
revised real analysis olympiad question
deleted 2 characters in body; edited tags
Aug
27
reviewed Leave Open Reduction formulae in definite integration
Aug
27
reviewed Leave Open Prove by induction and recursion that $n!=n(n-1)(n-2)…(3)(2)(1). $
Aug
27
reviewed Leave Open $\lim_{x\to \frac54\pi} \lfloor\sin x+ \cos x\rfloor$ where $\lfloor\cdot\rfloor$ is Greatest Integer Function, is $-1$ or $-2$? why?
Aug
27
reviewed Approve Example of Heine-Borel Theorem
Aug
27
revised Differential algebra and differential-algebraic equations
added 48 characters in body
Aug
27
revised Differential algebra and differential-algebraic equations
added 488 characters in body