I've heard "trigonometry is just the representation theory of the unitary group of degree 1" or some variation thereofhttps://twitter.com/epicciuto/status/1094605051363033088 …
Replying to @evertedsphere @mrkgrnao
Obligatory MO threadhttps://mathoverflow.net/questions/37021/is-fourier-analysis-a-special-case-of-representation-theory-or-an-analogue …
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