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m →Matrix operations: http→https for Google Books and Google News using AWB |
State that both scalar multiplication variants are defined |
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:<math>\operatorname{trace}(AB)\ne\operatorname{trace}(BA).</math>
Left scalar multiplication,
:<math>(cA)_{ij}=cA_{ij}, \qquad (Ac)_{ij}=A_{ij}c.\,</math>
Again, since multiplication is not commutative some care must be taken in the order of the factors.<ref>{{cite book |title=Matrix groups for undergraduates|first=Kristopher|last=Tapp
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