Holstein, BR2024-04-262024-04-262003-01https://hdl.handle.net/20.500.14394/40875The published version is located at http://www.springerlink.com/content/55khl2bp8eey60kp/The use of effective field theory techniques allows the basic physics to be extracted from otherwise complex systems. We cite examples from quantum mechanics, condensed-matter physics, QCD, and quantum gravity.Physical Sciences and Mathematicsarticle