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...Psychology multivariate statistics carey matrix algebra introduction to definitions a is collection of numbers ordered by rows and columns it customary enclose the elements in parentheses brackets or braces for example following x this has two three so referred as are numbered way that first subscript refers row second column important remember convention when performed vector special type only one called below while b scalar with denote scalars italicized lower case letters e g vectors bold matrices more than upper square many but not symmetric which all i j ij ji diagonal where off an identity s on almost always denoted addition subtraction add they both must have same number simply added together element produce results r then thus...