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visits member for 4 years, 5 months
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Mathematician, researching in Algebraic Geometry and related topics.


2d
awarded  Enlightened
2d
awarded  Nice Answer
2d
awarded  Nice Answer
2d
revised Pathologies of analytic (non-algebraic) varieties.
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2d
awarded  Good Answer
2d
revised A surface on which all regular curves have nowhere vanishing curvature
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2d
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
added 151 characters in body
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 research-level 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?
@ArtiePrendergast-Smith: 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