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1 Addition and subtraction

Matrices may be *added* if and only if they have the *same
dimension*. They are then said to be *conformable for
addition.* Each element in the first matrix is added to the
corresponding element in the second matrix to form the same element in
the solution.

or symbolically,

One *cannot add*

because they have a different number of rows.
Subtraction works in the same way as addition, e.g.

which is written

Jeff Lessem
2002-03-21