Editing Wave (section)

=== Dirac equation ===
The [[Dirac equation]] is a relativistic wave equation detailing electromagnetic interactions. Dirac waves accounted for the fine details of the hydrogen spectrum in a completely rigorous way. The wave equation also implied the existence of a new form of matter, antimatter, previously unsuspected and unobserved and which was experimentally confirmed. In the context of quantum field theory, the Dirac equation is reinterpreted to describe quantum fields corresponding to spin-{{frac|1|2}} particles.

[[File:Wave packet (dispersion).gif|class=skin-invert-image|thumb|A propagating wave packet; in general, the ''envelope'' of the wave packet moves at a different speed than the constituent waves.<ref name=Fromhold>{{cite book |title = Quantum Mechanics for Applied Physics and Engineering |author = A.T. Fromhold |chapter = Wave packet solutions |pages = 59 ''ff'' |quote = (p. 61) ...the individual waves move more slowly than the packet and therefore pass back through the packet as it advances |chapter-url = https://books.google.com/books?id=3SOwc6npkIwC&pg=PA59 |isbn = 978-0-486-66741-6 |publisher = Courier Dover Publications |year = 1991 |edition = Reprint of Academic Press 1981 }}</ref>]]