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 Nov 2 awarded Famous Question Sep 30 awarded Notable Question Aug 4 awarded Popular Question Jun 15 awarded Popular Question Dec 28 accepted Why don't we have particles whose wavefunctions are symmetric wrt one exchange operator and anti-symmetric wrt other exchange operator? Dec 27 comment Why don't we have particles whose wavefunctions are symmetric wrt one exchange operator and anti-symmetric wrt other exchange operator? @RobinEkman Could elaborate on how it would make particles $c,d$ distinguishable from $a,b$? Dec 27 comment Why don't we have particles whose wavefunctions are symmetric wrt one exchange operator and anti-symmetric wrt other exchange operator? Yes they are all of the same species. Dec 27 comment Why don't we have particles whose wavefunctions are symmetric wrt one exchange operator and anti-symmetric wrt other exchange operator? @RobinEkman My question is why can't we have particles satisfy which are anti-symmetric wrt $P_{a,b}$ and symmetric wrt $P_{c,d}$. Dec 27 comment Why don't we have particles whose wavefunctions are symmetric wrt one exchange operator and anti-symmetric wrt other exchange operator? @ACuriousMind The combined state will be still anti-symmetric wrt $P_{a,b}$ and symmetric wrt $P_{c,d}$. Dec 27 asked Why don't we have particles whose wavefunctions are symmetric wrt one exchange operator and anti-symmetric wrt other exchange operator? Nov 9 awarded Yearling Aug 23 awarded Favorite Question Jul 20 awarded Nice Question Jul 2 awarded Curious Apr 11 comment Why does Principle for least action hold for classical fields @Qmechanic The question I'm asking here is very different from those two questions. I'm not asking why motion of a particle follows the principle of least action, which comes from the Newton's laws. My question is for classical field theory like EM and gravitational field. One obvious answer is Newton's gravity law and Maxwell eqns imply the the principle of least action. But the fact that both of these field theories satisfy the least action principle, does that mean there is something deeper going around? Is it the particular of these laws which frorce them to satisfy the least action. Apr 10 revised Why does Principle for least action hold for classical fields added 75 characters in body Apr 10 revised Why does Principle for least action hold for classical fields added 5 characters in body Apr 10 revised Why does Principle for least action hold for classical fields added 107 characters in body Apr 10 asked Why does Principle for least action hold for classical fields Mar 20 asked A roadmap for learning standard model of particle physics