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Mathematician, researching in Algebraic Geometry and related topics.
2d

awarded  Enlightened 
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awarded  Nice Answer 
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awarded  Nice Answer 
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revised 
Pathologies of analytic (nonalgebraic) varieties.
added 18 characters in body 
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awarded  Good Answer 
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revised 
A surface on which all regular curves have nowhere vanishing curvature
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comment 
A surface on which all regular curves have nowhere vanishing curvature
Why? An ellipsoid has also this property, right? 
Dec 5 
comment 
Does one real radical root imply they all are?
@David: just out of curiosity, might I ask you why you did not accept the answer? 
Dec 1 
revised 
History of integral notation for coends
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Dec 1 
answered  History of integral notation for coends 
Nov 27 
comment 
Find all solutions in positive integers of the diophantine equation $w^2+x^2+y^2=z^2$
Hint: sthereographic projection. So said, I'm voting to close since this is not a researchlevel question. 
Nov 25 
comment 
singular point of a complete intersection surface
Of course. Let $H_1 \subset \mathbb{P}^3$ be a smooth quadric surface and $H_2$ a tangent plane to $H_1$. Then $H_1 \cap H_2$ is a pair of intersecting lines. See Roy's answer below. 
Nov 21 
revised 
Computing the nonsingular projective model of a plane curve
edited body 
Nov 21 
answered  Computing the nonsingular projective model of a plane curve 
Nov 17 
revised 
When is a surface in a threefold contractible to a curve?
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Nov 17 
comment 
When is a surface in a threefold contractible to a curve?
@ArtiePrendergastSmith: Right, my answer only considers extremal contractions. I corrected it. Thanks for the remark. 
Nov 15 
comment 
Reference request for cohomology of coverings
But why are you sure that this is true in such a generality? 
Nov 15 
awarded  Enlightened 
Nov 15 
awarded  Nice Answer 
Nov 15 
revised 
Curves on varieties, and a criterion for nef divisor
improved formatting 