User Scott Carter

16 votes

13 answers

4k views

Do you find your students are less competent in basic algebra and arithmetic, and, if so, do you believe that this is due to overuse of calculators at an early level? [closed]

asked Feb 11, 2010 at 20:39

14 votes

3 answers

620 views

Which closed orientable $4$-dimensional manifolds cannot be embedded in $6$-space?

asked Mar 11, 2012 at 3:06

10 votes

2 answers

17k views

Beamer printout [closed]

asked Nov 18, 2009 at 1:27

8 votes

5 answers

1k views

Braided Monoidal 2-categories with duals

asked Nov 10, 2009 at 0:50

7 votes

0 answers

320 views

What is the historical connection between Zeeman's twist spinning and Fox's Examples?

asked Sep 25, 2012 at 23:53

7 votes

0 answers

363 views

Is the category of tangles that includes, X, Y, and Lambda a free Frobenius braided category?

asked Jul 23, 2011 at 19:00

6 votes

2 answers

360 views

Knotted projective planes and fake complex projective space

asked Sep 9, 2013 at 20:53

4 votes

1 answer

377 views

Branched Coverings of the $4$-sphere branched along a knotted surface

asked Mar 10, 2012 at 14:25

4 votes

0 answers

534 views

Why are Lie Algebras/ Lie Groups so much like crossed modules, and not?

asked Jan 2, 2010 at 1:46

Stack Exchange Network

9 Questions

Do you find your students are less competent in basic algebra and arithmetic, and, if so, do you believe that this is due to overuse of calculators at an early level? [closed]

Which closed orientable $4$-dimensional manifolds cannot be embedded in $6$-space?

Beamer printout [closed]

Braided Monoidal 2-categories with duals

What is the historical connection between Zeeman's twist spinning and Fox's Examples?

Is the category of tangles that includes, X, Y, and Lambda a free Frobenius braided category?

Knotted projective planes and fake complex projective space

Branched Coverings of the $4$-sphere branched along a knotted surface

Why are Lie Algebras/ Lie Groups so much like crossed modules, and not?