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PhoenixFire
 3 years ago
Funtion Definitions
*Need editor hold on*
PhoenixFire
 3 years ago
Funtion Definitions *Need editor hold on*

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PhoenixFire
 3 years ago
Best ResponseYou've already chosen the best response.0If you define the folowing functions as such: \[f:[0,\infty )\rightarrow [0,\infty )\quad f\left( x \right) :=\sqrt { x } \\ g:[0,\infty )\rightarrow { R }\quad g\left( x \right) :=\sqrt { x }\] Is the composite \( f\circ g\) properly defined? I would think it is NOT as g(x) maps to all Real numbers, while the domain of f(x) is \([0,\infty)\).

zzr0ck3r
 3 years ago
Best ResponseYou've already chosen the best response.2R is codomain for the second function it maps to the Range which is [0,infinity)

PhoenixFire
 3 years ago
Best ResponseYou've already chosen the best response.0Ah, codomain not the range.

zzr0ck3r
 3 years ago
Best ResponseYou've already chosen the best response.2\[\sqrt{x}\ge0\] so \[\sqrt{\sqrt{x}}\] is fine

PhoenixFire
 3 years ago
Best ResponseYou've already chosen the best response.0@zzr0ck3r Thanks, codomain always confuses me. But I got it now.

zzr0ck3r
 3 years ago
Best ResponseYou've already chosen the best response.2codomain is what you are allowed to map to, range is what you map to
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