Donoghue, JFHolstein, BR2024-04-262024-04-261988https://hdl.handle.net/20.500.14394/40749Published version is located at http://ajp.aapt.org/resource/1/ajpias/v56/i3/p216_s1Although functional methods are common in the research literature, they are not generally seen by students until a course in field theory. Nevertheless, it is straightforward and pedagogically useful to treat a familiar problem—the harmonic oscillator—via such techniques, as shown in the present work.Physicsarticle