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147
Why is a topology made up of 'open' sets?
mathoverflow.net

61
Geometric interpretation of trace
mathoverflow.net

61
Geometric interpretation of trace
mathoverflow.net

42
Proof for the curl of a curl of a vector field
math.stackexchange.com

41
Describe a topic in one sentence.
mathoverflow.net

30
How to think of a set?
math.stackexchange.com

29
How do you explain what a hyperbolic PDE is...?
math.stackexchange.com

29
The Benign Apocalypse
worldbuilding.stackexchange.com

29
What is Quantization ?
mathoverflow.net

26
Why do we care about two subgroups being conjugate?
math.stackexchange.com

24
Why is the Kullback-Leibler divergence not symmetric?
math.stackexchange.com

24
How to learn QFT from mathematical perspective?
mathoverflow.net

23
Why does this matrix give the derivative of a function?
math.stackexchange.com

22
What would cut off a Mars base from Earth's support for an extended period of time?
worldbuilding.stackexchange.com

22
Why are Killing fields relevant in physics?
physics.stackexchange.com

21
Can government be funded by only printing more money and not taxing anyone?
worldbuilding.stackexchange.com

18
How to get the aspect ratio of an image?
math.stackexchange.com

17
Can I get away with lowering gravity so that the usual solar masses in our universe are simply planetary masses in the setting's universe?
worldbuilding.stackexchange.com

17
How to motivate and present epsilon-delta proofs to undergraduates?
mathoverflow.net

16
Optimization problems that today's students might actually encounter?
matheducators.stackexchange.com

16
Origins of Mathematical Symbols/Names
mathoverflow.net

15
Why is there "a Romeo" but not "a Juliet"?
english.stackexchange.com

15
What is the most general notion of "Fourier transform?"
math.stackexchange.com

14
When trying to learn analysis from bottom up, what numbers should I first construct?
math.stackexchange.com

13
Should I cite a paper that I haven't read if I use a theorem in it?
academia.stackexchange.com

13
Usage of "Pet" in "Pet Peeve"
ell.stackexchange.com

12
Is this statistic about the fatal accident rate correct?
aviation.stackexchange.com

12
What if the lecturer is not rigorous?
academia.stackexchange.com

12
Can a SAT solver be used to find all solutions?
stackoverflow.com

12
Different arrows in set theory: $\rightarrow$ and $\mapsto$
math.stackexchange.com

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