Concept

Non-Commutativity of Function Composition

Function composition is generally not commutative, meaning that the order in which two functions are composed matters. In other words, (fg)(x)(f \circ g)(x) does not necessarily equal (gf)(x)(g \circ f)(x). For example, given f(x)=4x5f(x) = 4x - 5 and g(x)=2x+3g(x) = 2x + 3, the composition (fg)(x)=8x+7(f \circ g)(x) = 8x + 7 while (gf)(x)=8x7(g \circ f)(x) = 8x - 7. These two results are different, which demonstrates that swapping the order of composition changes the outcome. This stands in contrast to operations like addition and multiplication, which are commutative.

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Updated 2026-05-25

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