I'd expect polynomial to follow definition of polynome: x^n + c where n, c are fixed and x goes 0,1,2,... with the progression instead of n^x + c ..the latt

I'd expect polynomial to follow definition of polynome: x^n + c where n, c are fixed and x goes 0,1,2,... with the progression instead of n^x + c ..the latter I'd call exponential progression