zero matrix with any other matrix is the zero matrix of the appropriate dimensions.
Example 2.2.04
but  is not defined
Example 2.2.05
Find A 2, where  .
Example 2.2.06
Find A 2, where  and k is any real number.
Note that in scalar arithmetic x 2 = 1 x = ±1, but in matrix multiplication
Example 2.2.07
Find A 2, where  .
Note that in scalar arithmetic x 2 = 0 x = 0, but in matrix multiplication
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