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64

What are your favorite instructional counterexamples?

52

Which mathematicians have influenced you the most?

46

Which math paper maximizes the ratio (importance)/(length)?

45

Which journals publish expository work? (2)

36

Most interesting mathematics mistake?

35

Is it best to run or walk in the rain?

31

What is the indefinite sum of tan(x)? (2)

31

“Closed-form” functions with half-exponential growth

26

Are there non-reflexive vector spaces isomorphic to their bi-dual?

25

Blackboard rendering of math fonts

25

Undergraduate Level Math Books (3)

24

Best online mathematics videos? (2)

24

Still Difficult After All These Years

24

Mathematical ideas named after places (2)

23

Is a inverse limit of compact spaces again compact ?

23

Interesting conjectures “discovered” by computers and proved by humans? (2)

21

Mathematical “urban legends”

20

The concept of Duality

20

Different ways of proving that two sets are equal

19

Jokes in the sense of Littlewood: examples?

18

When has pure mathematics been influenced by the social context of mathematicians?

17

The only great book that Bourbaki ever wrote?

17

What are the reasons for considering rings without identity?

17

Making N (set of all positive integers) a group

16

Interesting applications (in pure mathematics) of first-year calculus

16

What is happening to Martin Gardner’s files?

15

If $f$ is infinitely differentiable then $f$ coincides with a polynomial

14

Unbounded operator bounded in a dense subset

14

What’s an example of a space that needs the Hahn-Banach Theorem?

14

Question on geometric measure theory