Casteels

Member for 10 years, 1 month
Last seen more than a week ago

math.ucsb.edu/~casteels
Santa Barbara, CA

Summary

Reputation

11,192

11.2k
10.7k
10.2k

2020
2021
2022
2023

Top tag

graph-theory

Next privilege

15,000 Rep.

Protect questions

Badges

4

27

38

Newest

Yearling

Next badge

3/5

Curious

Answers

View all 289 answers

Score Activity Newest

97

Express 99 2/3% as a fraction? No calculator

Jun 9, 2015

54

Proof that $2^{222}-1$ is divisible by 3

Mar 12, 2015

27

Rational + irrational = always irrational?

Oct 28, 2013

24

when is $n!+10$ a perfect square?

Feb 24, 2015

23

How can I prove that one of $n$, $n+2$, and $n+4$ must be divisible by three, for any $n\in\mathbb{N}$

Oct 11, 2013

Questions

Score Activity Newest Views

4

Prime ideals and sagbi bases

Jan 27, 2014

2

Filling a grid so as not to completely fill any row, column or *any* diagonal

Nov 15, 2013

1

Standard name for ideals generated by a subset of indeterminates?

Jan 9, 2015

Tags

View all 118 tags

graph-theory

318

Score

157

posts

elementary-number-theory

122

Score

13

posts

algebra-precalculus

115

Score

5

posts

fractions

101

Score

2

posts

percentages

97

Score

1

post

Reputation

+10

Clarifying Dirac's theorem

+10

Why is the multiset of eigenvalues called spectrum?

+10

Determinant of the inverse matrix

+10

Planar graph and number of faces of certain degree

Badges

View all badges

4

gold badges

Populist

Mar 18, 2015
Electorate

Feb 9, 2015
Steward

Nov 12, 2015

27

silver badges

Deputy

Oct 28, 2014
Pundit

Dec 18, 2014
Strunk & White

Sep 29, 2014

38

bronze badges

graph-theory

Oct 17, 2014
Proofreader

Mar 2, 2014
Cleanup

Apr 9, 2014

Accounts

View all 7 accounts

11.2k
4
27
38

1,077
1
9
16

311
1
3
7

230
2
5

101
1

Active bounties (0)

Active Offered Earned

This user has no active bounties

Votes cast

1,896

upvotes

73

downvotes

991

question votes

978

answer votes