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 May 3 revised Good book about elementary particles for high school students? made title more descriptive May 3 suggested approved edit on Good book about elementary particles for high school students? May 3 revised Good book about elementary particles for high school students? added 221 characters in body; deleted 16 characters in body May 3 revised Good book about elementary particles for high school students? corrected link May 3 comment Good book about elementary particles for high school students? I wanted to upvote but being a person with big fingers on an ipad, your answer now shows a downvote. Please make an edit so that I may undo that. May 3 answered Good book about elementary particles for high school students? May 2 accepted How to construct the radial component of the momentum operator? May 1 revised How to construct the radial component of the momentum operator? deleted 13 characters in body; added 17 characters in body May 1 answered How to construct the radial component of the momentum operator? May 1 comment How to construct the radial component of the momentum operator? on second thought, your expression is correct for 1 dimensional space. For D dimensional euclidean space the expression is $$p_r = \frac{\hbar}{i}(\frac{\partial}{\partial r}+\frac{D-1}{2r})$$ Your expression is correct in 1D. Please make a trivial edit so I may atleast remove my downvote. May 1 asked How to construct the radial component of the momentum operator? Apr 29 revised Laplacian of $1/r^2$ (context: electromagnetism and poisson equation) added 1 characters in body Apr 29 revised Laplacian of $1/r^2$ (context: electromagnetism and poisson equation) added 163 characters in body; added 54 characters in body Apr 29 answered Laplacian of $1/r^2$ (context: electromagnetism and poisson equation) Apr 28 comment $\frac{1}{\sqrt{2}}$ (|Independent particle Model⟩+ |Strong Interaction Model⟩)? @Luboš Motl That clears it a lot. Thanks, as always. Apr 28 comment $\frac{1}{\sqrt{2}}$ (|Independent particle Model⟩+ |Strong Interaction Model⟩)? Thanks Anna that was insightful. Apr 28 accepted $\frac{1}{\sqrt{2}}$ (|Independent particle Model⟩+ |Strong Interaction Model⟩)? Apr 27 comment $\frac{1}{\sqrt{2}}$ (|Independent particle Model⟩+ |Strong Interaction Model⟩)? @David if you have ideas feel free to edit ;) Apr 27 comment Which Mechanics book is the best for beginner in math major? Although I have answered, I think this might be a sub duplicate of a more general question either here or on math.se If someone remembers they must link it as it had lots of references. Apr 27 answered Which Mechanics book is the best for beginner in math major?