3 ms·

>"As a second example of an additional symmetry in empty space, physics works, normally, the same when seen in the mirror. That leads to a very useful

>"As a second example of an additional symmetry in empty space, physics works, normally, the same when seen in the mirror. That leads to a very useful [usually, but not always!] conserved quantity called parity. Parity is somewhat different from momentum." Related: https://en.wikipedia.org/wiki/Parity_(physics) https://en.wikipedia.org/wiki/Parity_(physics) https://www.britannica.com/science/parity-particle-physics https://www.britannica.com/science/parity-particle-physics https://www.nobelprize.org/uploads/2018/06/yang-lecture.pdf https://www.nobelprize.org/uploads/2018/06/yang-lecture.pdf https://en.wikipedia.org/wiki/Conservation_law https://en.wikipedia.org/wiki/Conservation_law https://en.wikipedia.org/wiki/Noether%27s_theorem https://en.wikipedia.org/wiki/Noether%27s_theorem

>"As a sec­ond ex­am­ple of an ad­di­tional sym­me­try in empty space, physics works, nor­mally, the same when seen in the mir­ror. That leads to a very use­ful

>"As a sec­ond ex­am­ple of an ad­di­tional sym­me­try in empty space, physics works, nor­mally, the same when seen in the mir­ror. That leads to a very use­ful

>"As a second example of an additional symmetry in empty space, physics works, normally, the same when seen in the mirror. That leads to a very useful

>"As a second example of an additional symmetry in empty space, physics works, normally, the same when seen in the mirror. That leads to a very useful