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- <
- Form
**AB**. - <
- Form
**BA**. (Careful, this might be a trick question!)

- 1.
- Form .
- 2.
- Form .
- 3.
- In ordinary algebra, multiplication is
*commutative*, i.e. . In general, is matrix multiplication commutative?

- 4.
- Form .
- 5.
- Form .
- 6.
- In ordinary algebra, multiplication is
*distributive over addition*, i.e. . In general, is matrix multiplication distributive over matrix addition? Is matrix multiplication distributive over matrix subtraction?

Jeff Lessem 2002-03-21