Traditional differences between a physicist's point of view and an electrical engineer's point of view in studying electromagnetism have been noted. According to a 2023 lecture titled What Physicists Don't Know About Electromagnetism given by the theoretical physicist Hans Schantz and based on the comparison of textbooks Electromagnetic Theory by Julius Stratton and Classical Electrodynamics by John Jackson, Schantz argues "today's physicists who are educated using curriculum out of Jackson are less informed about practical electromagnetics than their counterparts of 80 years ago," and says it's because physicists are now shifted from classical electrodynamics to quantum electrodynamics. Schantz also continues that concepts like impedance, Smith chart, antenna, and electromagnetic energy flow, are not appreciated by physicists. Mathematician Sergei Schelkunoff who made many contributions to engineering electromagnetism also noted differences between physicist's and electrical engineer's view in electromagnetism. According to Schelkunoff: