I’ve also seen people internally use the word gradual and I prefer it to continuous because 1) in maths, a discontinuity can be an insignificant jump and 2) a fast takeoff is about fast changes in the growth rate, whereas continuity is about jumps in the function value (you can have either without the other). I don’t see a natural way to say non-gradual or a non-graduality though, which is why I do often say discontinuous instead.
“Continuous” vs “gradual”:
I’ve also seen people internally use the word gradual and I prefer it to continuous because 1) in maths, a discontinuity can be an insignificant jump and 2) a fast takeoff is about fast changes in the growth rate, whereas continuity is about jumps in the function value (you can have either without the other). I don’t see a natural way to say non-gradual or a non-graduality though, which is why I do often say discontinuous instead.