Editing 1949 in science (section)

==Physics==
* [[Freeman Dyson]] demonstrates the equivalence of the formulations of [[quantum electrodynamics]] existing at this time,<ref>{{cite journal|first=F. J.|last=Dyson|title=The radiation theories of Tomonaga, Schwinger, and Feynman|journal=[[Physical Review]]|volume=75|issue=3|pages=486–502|year=1949|doi=10.1103/PhysRev.75.486|bibcode=1949PhRv...75..486D|doi-access=free}}</ref> incidentally inventing the [[Dyson series]].<ref>{{cite journal|first=F. J.|last=Dyson|title=The ''S'' matrix in quantum electrodynamics|journal=Physical Review|volume=75|issue=11|pages=1736–1755|year=1949|doi=10.1103/PhysRev.75.1736|bibcode=1949PhRv...75.1736D}}</ref>
* The [[Lanczos tensor]] is introduced in [[general relativity]] by [[Cornelius Lanczos]].<ref>{{cite journal|first=Cornelius|last=Lanczos|title=Lagrangian Multiplier and Riemannian Spaces|journal=[[Reviews of Modern Physics]]|volume=21|issue=3|year=1949|pages=497–502|doi=10.1103/RevModPhys.21.497|bibcode=1949RvMP...21..497L |url=https://cds.cern.ch/record/1062657/files/RevModPhys.21.497.pdf|doi-access=free}}</ref>
* [[Pauli–Villars regularization]] is first published.<ref>{{cite journal|last1=Pauli|first1=W.|authorlink1=Wolfgang Pauli|last2=Villars|first2=F.|authorlink2=Felix Villars|title=On the Invariant Regularization in Relativistic Quantum Theory|journal=Reviews of Modern Physics|volume=21|issue=3|pages=434–444|year=1949|bibcode=1949RvMP...21..434P|doi=10.1103/RevModPhys.21.434|doi-access=free}}</ref>