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21 votes

What is this 2D division algebra?

abstract-algebra division-algebras asked Aug 25 '18 at 18:47
math.stackexchange.com

18 votes

In what sense (if any) is Action a physical observable?

quantum-mechanics classical-mechanics lagrangian-formalism action observables asked Jul 23 '17 at 1:12
physics.stackexchange.com

13 votes

Electromagnetic field energy “paradox”

electromagnetism energy magnetic-fields dipole asked Oct 5 '17 at 4:32
physics.stackexchange.com

10 votes

Relationship between Spin(3), SU(2), unit quaternions, and SO(3)

group-theory group-isomorphism quaternions asked Apr 4 '17 at 20:11
math.stackexchange.com

8 votes

“Non-pointer POD” type in C++

c++ types asked Jan 24 '18 at 14:51
stackoverflow.com

7 votes

Do galaxies have a halo of neutrinos and cosmic microwave background?

cosmology big-bang dark-matter galaxies gravitational-collapse asked Apr 21 '17 at 3:17
physics.stackexchange.com

5 votes

Current constraints on Dark Matter self-interaction from galactic profiles

gravity cosmology dark-matter galaxies weak-interaction asked Apr 11 '17 at 19:43
physics.stackexchange.com

5 votes

How to see $\mathbf{E}\cdot\mathbf{B}$ is a total derivative?

homework-and-exercises electromagnetism lagrangian-formalism field-theory asked Oct 3 '17 at 2:19
physics.stackexchange.com

5 votes

Are there any decision complexity classes which have no “complete” subclass?

complexity-theory reductions asked Apr 12 '17 at 19:21
cs.stackexchange.com

5 votes

Existence of suitable pseudo-random number generators to derandomize BPP to P

complexity-theory randomized-algorithms pseudo-random-generators oracle-machines asked Apr 12 '17 at 22:45
cs.stackexchange.com


Top Answers