Question

What is the euler characteristic of two, doubly-punctured projective planes, joint together

score 304 · Answer 1 · 2017-02-17 03:46:53

304

Views

What is the euler characteristic of two, doubly-punctured projective planes, joint together

Published on 17 Feb 2017 - 3:46

score 100 · Answer 2 · 2017-02-19 15:18:55

100

Views

Product of regular map is regular

Published on 19 Feb 2017 - 15:18

score 130 · Answer 3 · 2017-02-27 17:45:11

130

Views

Are $\mathbb{RP}^n$ and $\mathbb{CP}^n$ metrizable?

Published on 27 Feb 2017 - 17:45

score 36 · Answer 4 · 2017-03-01 21:50:52

36

Views

Prove, that if $a \in End(V)$ and $a^2 = a$ than $V = Ker(a) \oplus Ker(id_v + a)$

Published on 01 Mar 2017 - 21:50

score 66 · Answer 5 · 2017-03-03 16:02:22

66

Views

Compute the homogenizations $\bar f_1$ and $\bar f_2$ if the polynomials $f_1 = y -x^2$ and $f_2 = z - xy$

Published on 03 Mar 2017 - 16:02

score 55 · Answer 6 · 2017-03-04 21:50:29

55

Views

When are $(a_1,...,a_n)\in \mathbb{A}_i^n$ and $(b_1,...,b_n)\in \mathbb{A}_j^n$ for some $i < j$ equal to each other?

Published on 04 Mar 2017 - 21:50

score 1.2k · Answer 7 · 2026-03-25 10:57:11

1.2k

Views

Which line bundles on a product of projective spaces are ample?

Published on 25 Mar 2026 - 10:57

score 393 · Answer 8 · 2026-03-25 15:58:15

393

Views

Elliptic curve group - associativity when some points are equal

Published on 25 Mar 2026 - 15:58

score 1.3k · Answer 9 · 2026-03-26 06:06:47

1.3k

Views

Not understanding the concept of "irreducibility" for quasi-projective varieties

Published on 26 Mar 2026 - 6:06

score 38 · Answer 10 · 2026-03-26 12:37:11

38

Views

Number of points of $\mathbb{P}^n$ over $\mathbb{F}_p$

Published on 26 Mar 2026 - 12:37

score 52 · Answer 11 · 2026-03-25 20:41:19

52

Views

Does reflection group induce group structure on $\mathbb{R}P^n$

Published on 25 Mar 2026 - 20:41

score 15 · Answer 12 · 2017-03-10 22:54:40

15

Views

About projective varieties

Published on 10 Mar 2017 - 22:54

score 144 · Answer 13 · 2026-03-28 15:45:49

144

Views

Equivalence relation $x \sim y$ if $x = \lambda y$ for a non-zero real number $\lambda$

Published on 28 Mar 2026 - 15:45

score 316 · Answer 14 · 2017-03-18 23:01:03

316

Views

Hartshorne, Corollary 2.3 question, which topology?

Published on 18 Mar 2017 - 23:01

score 727 · Answer 15 · 2017-03-19 05:48:24

727

Views

Calculating the cohomology of $\mathbb{R}P^{n}$ using the cup product

Published on 19 Mar 2017 - 5:48

List Question

What is the euler characteristic of two, doubly-punctured projective planes, joint together

Product of regular map is regular

Are $\mathbb{RP}^n$ and $\mathbb{CP}^n$ metrizable?

Prove, that if $a \in End(V)$ and $a^2 = a$ than $V = Ker(a) \oplus Ker(id_v + a)$

Compute the homogenizations $\bar f_1$ and $\bar f_2$ if the polynomials $f_1 = y -x^2$ and $f_2 = z - xy$

When are $(a_1,...,a_n)\in \mathbb{A}_i^n$ and $(b_1,...,b_n)\in \mathbb{A}_j^n$ for some $i < j$ equal to each other?

Which line bundles on a product of projective spaces are ample?

Elliptic curve group - associativity when some points are equal

Not understanding the concept of "irreducibility" for quasi-projective varieties

Number of points of $\mathbb{P}^n$ over $\mathbb{F}_p$

Does reflection group induce group structure on $\mathbb{R}P^n$

About projective varieties

Equivalence relation $x \sim y$ if $x = \lambda y$ for a non-zero real number $\lambda$

Hartshorne, Corollary 2.3 question, which topology?

Calculating the cohomology of $\mathbb{R}P^{n}$ using the cup product

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