This is a 2x2 matrix. It has 2 rows that go side to side. 2 columns that go side to side.
This is a 3x2 Matrix. It has 3 rows and 2 columns
This is a 3x3 matrix. 3 rows by 2 columns
This is a special kind of matrix. It is called an Identity Matrix. It serves as the multiplicative identity.
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