====== Superselection Rule ====== Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party. * http://philsci-archive.pitt.edu/3585/1/SSR-QMC-NetVersion.pdf The motto in this section is: //the higher the level of abstraction, the better//. --> Example1# <-- --> Example2:# <--