Question

Compact connected surfaces such that non-null homotopic map exists from itself to $\mathbb S^1$.

score 321 · Answer 1 · 2020-12-04 11:23:27

321

Views

Compact connected surfaces such that non-null homotopic map exists from itself to $\mathbb S^1$.

Published on 04 Dec 2020 - 11:23

score 210 · Answer 2 · 2026-03-29 02:30:30

210

Views

Self intersection of zero section of decomposable ruled surface

Published on 29 Mar 2026 - 2:30

score 227 · Answer 3 · 2026-03-26 01:27:24

227

Views

Fano surface vs. del Pezzo surface

Published on 26 Mar 2026 - 1:27

score 151 · Answer 4 · 2026-03-26 07:38:52

151

Views

Pencil of cubics with infinitely many exceptional curves

Published on 26 Mar 2026 - 7:38

score 64 · Answer 5 · 2020-12-08 00:36:51

64

Views

Non null-homotopic map from $M$ to $ \mathbb S^1$ implies non null-homotopic map from $M \# M'$ for a surface $M'$

Published on 08 Dec 2020 - 0:36

score 680 · Answer 6 · 2020-12-09 17:56:00

680

Views

Euler characteristic of a sphere with $n$ holes?

Published on 09 Dec 2020 - 17:56

score 31 · Answer 7 · 2020-12-09 20:59:25

why is $(dX)_{q}: \mathbb{R}^2 \rightarrow \mathbb{R}^3 $ injective equivalent to saying that $X_{u}(q) $ and $X_{v}(q) $ are linearly independent?

score 504 · Answer 8 · 2020-12-11 04:07:14

504

Views

Picard group of a ruled surface

Published on 11 Dec 2020 - 4:07

score 200 · Answer 9 · 2026-03-26 11:00:54

200

Views

Exercise in Beauville, about the blowup of $P^2$ at seven points

Published on 26 Mar 2026 - 11:00

score 46 · Answer 10 · 2020-12-16 07:15:38

46

Views

Contour question - Draw contours for In (xy) = c

Published on 16 Dec 2020 - 7:15

score 80 · Answer 11 · 2026-03-25 22:06:05

80

Views

What is the equation for a line in a family ruling a rectangle, given the rectangle's dimensions and a point on the line inside the rectangle?

Published on 25 Mar 2026 - 22:06

score 618 · Answer 12 · 2026-04-01 17:04:32

618

Views

Angle between a surface and a curve.

Published on 01 Apr 2026 - 17:04

score 66 · Answer 13 · 2020-12-18 20:46:04

66

Views

Closest point on a̶ ̶s̶u̶r̶f̶a̶c̶e̶ 3d bell curve to a point

Published on 18 Dec 2020 - 20:46

score 95 · Answer 14 · 2026-03-28 23:58:37

95

Views

Is it possible to find the flux of a vector field through a surface (e.g. disk, ellipsoid) without computing an integral?

Published on 28 Mar 2026 - 23:58

score 30 · Answer 15 · 2020-12-21 00:23:22

30

Views

Surface Definition From a Normal Vector.

Published on 21 Dec 2020 - 0:23

List Question

Compact connected surfaces such that non-null homotopic map exists from itself to $\mathbb S^1$.

Self intersection of zero section of decomposable ruled surface

Fano surface vs. del Pezzo surface

Pencil of cubics with infinitely many exceptional curves

Non null-homotopic map from $M$ to $ \mathbb S^1$ implies non null-homotopic map from $M \# M'$ for a surface $M'$

Euler characteristic of a sphere with $n$ holes?

why is $(dX)_{q}: \mathbb{R}^2 \rightarrow \mathbb{R}^3 $ injective equivalent to saying that $X_{u}(q) $ and $X_{v}(q) $ are linearly independent?

Picard group of a ruled surface

Exercise in Beauville, about the blowup of $P^2$ at seven points

Contour question - Draw contours for In (xy) = c

What is the equation for a line in a family ruling a rectangle, given the rectangle's dimensions and a point on the line inside the rectangle?

Angle between a surface and a curve.

Closest point on a̶ ̶s̶u̶r̶f̶a̶c̶e̶ 3d bell curve to a point

Is it possible to find the flux of a vector field through a surface (e.g. disk, ellipsoid) without computing an integral?

Surface Definition From a Normal Vector.

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