The $k$th ChebshevChebyshev polynomial is denoted by $T_k$ where
$T_k(x) = \cos(k\cos^{-1}(x))$
I was wondering where this notation came from. It has been suggested that it comes from TchebychefTschebyscheff (the Russian name for ChebshevChebyshev) but does anyone know the first use of this notation or verify this is the reason?