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## Homework Statement

I constructed my own question to try to make sense of the following notation.

g(x) = 2√x g : X → Y. What does X and Y equal?

## Homework Equations

For 2√x, x = or > than 0.

## The Attempt at a Solution

g(x) = 2√x g : [0, ∞) → [0, ∞)

So X = Y = [0, ∞)

The reason why I am doing this is because my book shows this: g(x) = 2√x g : [1,∞) → [2,∞). Why does my book have a 1 instead of a 0 as an initial x value?

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