Before you can multiply two matrices together, the number of COLUMN in the first matrix must equal the number of rows in the second matrix.
The entries of a matrix are a rectangular array of numbers (or other mathematical objects). Standard operations like addition and multiplication can be performed on matrices. A matrix over a field F is often just a rectangular array of F's constituent elements. Real and complex matrices are those whose entries are real or complex numbers, respectively.
The entries or elements of the matrix are its numbers, symbols, or phrases. In a matrix, the terms "rows" and "columns" refer to the horizontal and vertical rows of entries, respectively.
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