What is the Proof for f=h when fog=x and goh=x in Composition?

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SUMMARY

The discussion centers on proving that if the compositions fog = x and goh = x hold true for all x, then it follows that f = h. The key concept utilized is the associativity of function composition. The user attempts to manipulate the equations fog = goh and fo(goh) = (goh)oh to derive the conclusion. The proof relies on understanding the properties of function composition and the implications of equal outputs for different function compositions.

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  • Understanding of function composition in mathematics
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Homework Statement



Can't believe I forgot how to do this...

Prove if fog = x and goh = x then f=h for all x.

Homework Equations



Obviously the associativity of composition here.

The Attempt at a Solution



So we know :

fog = goh
fogoh = gohoh
fo(goh) = (goh)oh

I've forgotten how to do the rest here.
 
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Any pointers at all?
 
h = (f \circ g) \circ h = \ldots
 

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