User Jun Lu

13 votes

1 answer

1k views

How to compute the Picard-Lefschetz monodromy matrix of a non-semistable fiber?

asked Apr 2, 2010 at 3:21

11 votes

0 answers

561 views

How to get a Dehn-twist presentation of a periodic map of a Riemann surface?

asked Jul 5, 2010 at 6:30

5 votes

2 answers

2k views

What is the definition of ideal boundary?

asked May 31, 2010 at 3:55

4 votes

2 answers

513 views

Why do the subgroups of $Hdg^{2k}(X)$ generated by the cycle classes and Chern classes of vector bundles coincide in algebraic variety $X$?

asked Jul 12, 2011 at 7:43

3 votes

1 answer

225 views

Why $\pi_1(X)\cong \pi_1(Y)$ for a double cover $\pi:X\to Y$ with a nef, smooth and big branch locus?

asked Oct 27, 2012 at 16:56

2 votes

1 answer

1k views

What is Mordell-Weil lattice?

asked Jun 25, 2010 at 11:09

2 votes

0 answers

507 views

How to find the global equation of a dual curve?

asked Oct 27, 2012 at 16:34

1 vote

0 answers

88 views

How to prove Butler's inequality for the maximal slope of the kernel bundle?

asked Mar 30, 2015 at 5:10

1 vote

2 answers

304 views

Why does the divisor $Z$ homologous to $0$ in projective mainfold satisfy that every irreducible hypersurface appears in $Z$ with multiplicity $1$?

asked Jul 14, 2011 at 4:46

0 votes

1 answer

485 views

What is a right-handed Dehn twist of a cut curve of a Riemann surface?

asked Jun 24, 2010 at 7:03

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10 Questions

How to compute the Picard-Lefschetz monodromy matrix of a non-semistable fiber?

How to get a Dehn-twist presentation of a periodic map of a Riemann surface?

What is the definition of ideal boundary?

Why do the subgroups of $Hdg^{2k}(X)$ generated by the cycle classes and Chern classes of vector bundles coincide in algebraic variety $X$?

Why $\pi_1(X)\cong \pi_1(Y)$ for a double cover $\pi:X\to Y$ with a nef, smooth and big branch locus?

What is Mordell-Weil lattice?

How to find the global equation of a dual curve?

How to prove Butler's inequality for the maximal slope of the kernel bundle?

Why does the divisor $Z$ homologous to $0$ in projective mainfold satisfy that every irreducible hypersurface appears in $Z$ with multiplicity $1$?

What is a right-handed Dehn twist of a cut curve of a Riemann surface?