LINEAR ALGEBRA Matrices Matrix Operations and Properties Determinants
LINEAR ALGEBRA Matrices Matrix Operations and Properties Determinants
MATRICES
MATRICES
MATRICES The size of a matrix is described in terms of the number of rows (horizontal lines) and columns (vertical lines) it contains. For example, the first matrix in Example 1 has three rows and two columns, so its size is 3 by 2 (written 3 × 2). In a size description, the first number always denotes the number of rows, and the second denotes the number of columns.
MATRICES
MATRICES
MATRICES
MATRICES
CLASSIFICATION OF MATRICES
CLASSIFICATION OF MATRICES
CLASSIFICATION OF MATRICES
CLASSIFICATION OF MATRICES
CLASSIFICATION OF MATRICES
TRANSPOSE OF A MATRIX
CLASSIFICATION OF MATRICES
MATRIX OPERATIONS AND PROPERTIES
DEFINITION
EQUALITY OF MATRICES
DEFINITION
ADDITION AND SUBTRACTION
DEFINITION
SCALAR MULTIPLES
DEFINITION
DEFINITION
MULTIPLYING MATRICES
MULTIPLYING MATRICES
MULTIPLYING MATRICES
Determining Whether a Product is Defined
Determining Whether a Product is Defined
DETERMINANTS
PERMUTATION
PERMUTATION
INVERSION
INVERSION Solution: a) (3, 1, 4, 2) We will start at the left most number and count the number of numbers to the right that are smaller. We then move to the second number and do the same thing. We continue in this manner until we get to the end. The total number of inversions are then the sum of all these. (3, 1, 4, 2) 2 inversions (3, 1, 4, 2) 0 inversions (3, 1, 4, 2) 1 inversion The permutation (3, 1, 4, 2) has a total of 3 inversions.
INVERSION b) (1, 2, 4, 3) 0 + 1 =1 inversion c) (4, 3, 2, 1) 3 + 2 + 1 = 6 inversions d) (1, 2, 3, 4, 5) No inversions e) (2, 5, 4, 1, 3) 1 + 3 + 2 + 0 = 6 inversions
PERMUTATION A permutation is called even if the number of inversions is even and odd if the number of inversions is odd. Example 4: Classify as even or odd all the permutations of the following lists. a) {1, 2} b) {1, 2, 3} Solution: a)
PERMUTATION b)
ELEMENTARY PRODUCT
ELEMENTARY PRODUCT
ELEMENTARY PRODUCT
ELEMENTARY PRODUCT
SIGNED ELEMENTARY PRODUCT
SIGNED ELEMENTARY PRODUCT Solution: a) b)
DEFINITION 1
DETERMINANT
METHODS OF FINDING A SOLUTION
METHODS OF FINDING A SOLUTION
METHODS OF FINDING A SOLUTION
EXERCISES
EXERCISES II. Use Cramer’s rule to solve the ff. linear system x–y+z=4 2 x + y + z = 7 – x – 2 y + 2 z = – 1
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