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 Mar 30 awarded Notable Question Mar 13 awarded Disciplined Mar 10 awarded Yearling Nov 24 comment Heuristics behind Dirac delta function in Master equation for probability? Excellent! But for completing your answer, how would you derive the differential equation intuitively? Nov 13 revised Heuristics behind Dirac delta function in Master equation for probability? added 42 characters in body Nov 6 asked Heuristics behind Dirac delta function in Master equation for probability? Oct 21 accepted Prove that if $\hat H | a_n\rangle=a_n|a_n\rangle$, then $f(\hat H)| a_n\rangle=f(a_n)|a_n\rangle$ Sep 5 comment Can a baseball travel through the Sun? @Alex It seems that you want the conditions under a ball could pass through the sun. I suggest to edit your question. Also, your question is quantifiable, you could make a short calculation to get the answer. Sep 5 answered Twins Paradox - Does ageing depend on motion? Sep 4 comment Wavefunctions in different Hilbert spaces @Timaeus is right, there aren't lots of different Hilbert spaces, but there are lots of different basis, say $\{|x\rangle\}$ or $\{|p\rangle\}$. And BTW, $\psi(x,y):=\langle x, y |\psi \rangle$. Sep 4 comment Wavefunctions in different Hilbert spaces @march Actually, the correct expression would be writing $| \psi \rangle$ at the left hand side (without the $x$ in $\psi(x)$, because $| \psi \rangle$ does not depend on x, but when you project at the position space you have: $\psi(x):=\langle x| \psi \rangle$). Sep 4 asked Prove that if $\hat H | a_n\rangle=a_n|a_n\rangle$, then $f(\hat H)| a_n\rangle=f(a_n)|a_n\rangle$ Jun 18 awarded Notable Question May 12 awarded Popular Question May 11 awarded Popular Question Mar 17 awarded Popular Question Dec 8 awarded Popular Question Dec 1 comment Are there diffrent understandings of dimensions? As you said we certainly live in 3 SPATIAL dimensions. And using only these 3 spatial dimensions and time we can describe phenomena involving a set of physical properties likes mass, charge, electric/magnetic moment, current, refraction index, etc. Nov 25 asked Examples of systems with linear response behavior Nov 4 awarded Yearling