noncommutative
adjective
non·com·mu·ta·tive
ˌnän-kə-ˈmyü-tə-tiv
-ˈkäm-yə-ˌtā-tiv
mathematics
: of, relating to, having, or being the property that a given mathematical operation and set have when the result obtained using any two elements of the set with the operation differs with the order in which the elements are used : not commutative
Subtraction is a noncommutative operation.
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