Robin Chapman

14,304 reputation

22551

bio	website	empslocal.ex.ac.uk/people/…
	location	Exeter, United Kingdom
	age
visits	member for	2 years, 10 months
	seen	Jan 10 '11 at 11:54
stats	profile views	3,345

	14,304 reputation	bio	website	empslocal.ex.ac.uk/people/…	visits	member for	2 years, 10 months
22551 badges		location	Exeter, United Kingdom		seen	Jan 10 '11 at 11:54

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Dec 9	awarded	Nice Answer
Dec 9	comment	Is $\frac{e^z-1}{e^z+1}$ analytic? This is certainly homework somewhere :-) empslocal.ex.ac.uk/people/staff/rjchapma/courses/an10/an4.pdf
Dec 9	comment	Why is it harder to prove which integers are sums of three squares rather than sums of two squares or four squares? Thanks Steven, I hope I've caught all the miscreant $n$s.
Dec 9	revised	Why is it harder to prove which integers are sums of three squares rather than sums of two squares or four squares? corrected variables
Dec 9	answered	Why is it harder to prove which integers are sums of three squares rather than sums of two squares or four squares?
Dec 8	comment	Logic in the metatheory Model theory is part of set theory, so use your favourite set axioms, eg. ZF or ZFC.
Dec 8	awarded	Nice Answer
Dec 8	revised	Does $R[x] \cong S[x]$ imply $R \cong S$? added content
Dec 8	answered	Does $R[x] \cong S[x]$ imply $R \cong S$?
Dec 7	comment	Is this definite integral really independent of a parameter? How can it be shown? You can certainly evaluate it via contour integration.
Dec 7	revised	Proof for an integral involving sinc function corrected detail
Dec 7	answered	can any continuous function be represented as a sum of convex and concave function?
Dec 7	revised	Proof for an integral involving sinc function deleted 3 characters in body
Dec 7	comment	Intersection of neighborhoods of 0. Subgroup? Roughly speaking yes, you need that $W$ contains a set $V\times V$ where $V$ is a neighbourhood of $0$ in $G$.
Dec 7	answered	Intersection of neighborhoods of 0. Subgroup?
Dec 7	answered	Proof for an integral involving sinc function
Dec 6	comment	figuring out the x,y, and z rotation of a right triangle? Triangles generally have three vertices, and three angles.
Dec 6	answered	Why is $\mathbb{C}[x,y]$ not isomorphic to $\mathbb{C}[x] \otimes _{\mathbb{Z}} \mathbb{C}[y]$ as rings?
Dec 5	comment	Analytic Geometry \| Two Planes and a Angle \| Two Solutions That follows from orthogonality; now use $60^\circ$.
Dec 5	answered	Invariant dimension property