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f o g(x)
36You mean (f o g)(x) but the thing in the image is actually (g o f)(x) because that's how the composition operator is defined, we first take g and then f and not the other way around.
-3What are you talking about? OP got it right: https://en.m.wikipedia.org/wiki/Function_composition
19
to be super pedantic, the right picture should say $x \mapsto f(g(x))$
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