# What does it mean if two transformations are commutative?

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## Which of the following are commutative?

The word “commutative” comes from “commute” or “move around”, so the Commutative Property is the one that refers to moving stuff around. For addition, the rule is “a + b = b + a”; in numbers, this means 2 + 3 = 3 + 2. For multiplication, the rule is “ab = ba”; in numbers, this means 2×3 = 3×2.

## Are two translations commutative?

For instance, one can think of a translation of axes in the coordinate plane as an “element,” and following one translation by another as a “product.” Then, if T1 and T2 are two such translations, T1T2 and T2T1 are equal. This operation is commutative.

## Are transformations associative?

(ii) If A, B and C are transformations then (A B)C=A(B C). That is, doing transformations one after another is associative.

## Are matrix transformations commutative?

Matrix multiplication is not commutative. It shouldn’t be. It corresponds to composition of linear transformations, and composition of func- tions is not commutative.

## Are linear transformations commutative?

In particular, linear transformations do not satisfy the commutative law either, so (3) is FALSE. to x. A linear transformation T is invertible if there exists a linear transformation S such that T ◦ S is the identity map (on the source of S) and S ◦ T is the identity map (on the source of T). 1.

## Is rotation commutative in 2d?

The two-dimensional case is the only non-trivial (i.e. not one-dimensional) case where the rotation matrices group is commutative, so that it does not matter in which order multiple rotations are performed.

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