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visits member for 2 years, 5 months
seen Dec 14 at 18:42

Sep
7
answered It seems obvious, but how to prove it formally?
Sep
7
revised Does $V_1,V_2,V_3$ span $R^4$
Fixed LaTeX syntax for matrices
Sep
7
comment How to write such a constraint?
Would inequalities be acceptable as constraints? Specifically I think $x_{ij}x_{jk} \le x_{ik}$ would work.
Sep
7
answered Set Theory - How do I solve this problem?
Sep
6
comment Calculating the signature of matrix A?
But is it also easier to subtract three times the first row from the last one, than it is to subtract three times the last row from the first one?
Sep
6
comment Calculating the signature of matrix A?
Given that the first two steps just turn the matrix upside down, I don't see how they make anything easier.
Sep
6
comment Calculating the signature of matrix A?
What are the first two steps for?
Sep
6
answered Is there a thing named a “spiral plane” which is a plane but it's spiral?
Sep
6
revised Find the domain of the function $f(x) =\frac{x+4}{x^2-9}$
TeXified
Jul
16
comment What makes induction a valid proof technique?
And how do you show that $k^2<k$ if $0<k<1$?
Jul
2
awarded  Yearling
Jul
2
awarded  Curious
Jun
22
comment What is more important in Mathematics, Theorems or its Proofs?
@IttayWeiss: Never mind.
Jun
22
comment What is more important in Mathematics, Theorems or its Proofs?
@IttayWeiss: (a) It doesn't matter. (b) If so, we will probably never know. They probably wouldn't have written in their article "One day we woke up and thought about these random axioms ..."
Jun
22
comment What is more important in Mathematics, Theorems or its Proofs?
@IttayWeiss: And I never claimed you said that. My comment above was a reply to the question (specifically referring to "View 1"). If it had been a comment to your answer, I would have attached it to your answer.
Jun
22
answered joint probability equals to marginal probability
Jun
22
comment What is more important in Mathematics, Theorems or its Proofs?
Non-Euclidean geometry came into being exactly by deducing consequences if the parallels axiom were not true (actually in the hope of finding a contradiction). Only after that had been done, people realized that this indeed led to a valid theory.
Jun
22
comment What is more important in Mathematics, Theorems or its Proofs?
"Nobody wakes up in the morning, randomly chooses some axioms and starts deducing theorems." That's a pretty strong statement. Are you really sure not a single person has ever done exactly that?
May
17
comment Extending the set of complex numbers
There is no reason to restrict to non-constant polynomials. A non-zero constant polynomial has degree $n=0$ and $n=0$ complex solutions, so the statement is just as true for those. Only for the zero polynomial you need an exception.
May
1
awarded  Guru