Bart Patzer
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 Apr 3 accepted Trust-region method Apr 3 comment Trust-region method Thanks a lot for wanting to help. Could you please elaborate on one point: why can we assume A is diagonal w.l.o.g.? I'm sure your right, I just don't see it. Apr 1 revised Trust-region method edited tags Apr 1 asked Trust-region method Sep 20 comment Proof of derivative of $e^x$ is $e^x$ without using chain rule But isn't the hardest part left? Namely demonstrating that $\lim_{h\to 0}\frac{e^h-1}{h}=1$... Dec 7 awarded Popular Question Dec 2 awarded Yearling Jul 2 awarded Curious Oct 5 accepted How to iterate over power set in MAGMA? Oct 5 revised How to iterate over power set in MAGMA? added 141 characters in body Oct 5 asked How to iterate over power set in MAGMA? Sep 11 accepted Picking out columns from a matrix using MAGMA Sep 9 asked Picking out columns from a matrix using MAGMA May 23 revised Extending an ideal of a polynomial ring to a polynomial ring with more indeterminates. Is it a tensor product? deleted 85 characters in body May 16 accepted Is the image of a tensor product equal to the tensor product of the images? May 16 comment Is the image of a tensor product equal to the tensor product of the images? Thanks a lot for great answer. I don't quite see what the unique injection $\mathbb{Z}/2\mathbb{Z}\rightarrow\mathbb{Q}/\mathbb{Z}$ is though...could you please tell me? And what if all the modules $A,A',B,B'$ are free $S$- modules (even finitely generated), do we then have $$\operatorname{im}(\phi\otimes\psi)=\operatorname{im}(\phi)\otimes_{S}\operator‌​name{im}(\psi)?$$ May 16 asked Is the image of a tensor product equal to the tensor product of the images? May 5 comment Showing that the Taylor series of $f(x)=\frac{1}{\sqrt{1+x}}$ converges to $f$ on (I think) the interval (-1,1]. Well, thanks a lot. This is a first year calculus exercise though, and neither complex analysis nor binomial coefficients involving non-natural numbers are part of the curriculum...far from it:) May 5 asked Showing that the Taylor series of $f(x)=\frac{1}{\sqrt{1+x}}$ converges to $f$ on (I think) the interval (-1,1]. May 5 accepted Manipulation of some power series (probably integration or derivation).