〈 Berger | Dillon 〉

T_n( cos(theta) ) = cos(n theta) where T_n is the nth Chebyshev polynomial of the first kind.

Tₙ(cos(θ)) = cos(n⋅θ) (using https://www.unicodeit.net/ )

subscript n actually doesn't render for standard unicode

Huh, thanks that's useful to know. It renders correctly in Chrome and Firefox on my laptop and in the Twitter app on my phone (android). Are they using non-standard/extended unicode? It's a shame http://unicodeit.net  doesn't indicate when it's using non-standard characters

there's a wikipedia page that documents all the supported super/sub scripts .. Android actually uses html embedding for some of them .. so things that work on android actually aren't visible on other OS's

Am I reading this wrong? Subscript-n seems to be in there: https://en.wikipedia.org/wiki/Superscripts_and_Subscripts_(Unicode_block) …