Matrices
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Definition of a matrix:
 Any 2dimensional array of real or complex numbers.
Square matrix:
 A matrix of type .
Diagonal:
 The entries of a square matrix in the ith line and ith column (same index i), for some i.
Identity matrix:
 A square matrix with 1’s on the diagonal and 0’s off the diagonal.
Zero matrix:
 Any matrix (of any type), with only zero entries.
Definition of a 2dimensional matrix:
 We define of a 2dimensional matrix as: .
Definition of the rank of a matrix:
 The rank of a matrix A is the greatest n such that A has a square submatrix of type nxn with determinant not equal to zero.
Definition of an invertible matrix:
 We say a square matrix A is invertible if there exits a (square) matrix such that =identity matrix.
Cramer’s Rule:
 If is a square matrix, then the equation has a unique solution if and only if and the solution is.

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"Title" Tutorial Summary : 
Linear systems can be solved with the use of matrices. Matrix properties and operations facilitated the arrival to solutions with fewer calculations. Some examples show matrix computations and the nature of their solutions.
The idea of Cramer’s rule can be formulated with the use of matrices. Cramer’s rule is a famous rule that uses determinants to finding solutions to a system of equations. The addition or multiplication of rows and columns in a matrix allow matrices to be reduced.

Tutorial Features: 
Specific Tutorial Features:
• Matrix operations are shown in some of the examples.
• Matrix computations are presented in the examples.
• Step by step explanation of the rank of a matrix with respect to a determinant is shown in a couple of examples.
Series Features:
• Concept map showing interconnections of new concepts in this tutorial and those previously introduced.
• Definition slides introduce terms as they are needed.
• Visual representation of concepts
• Animated examples—worked out step by step
• A concise summary is given at the conclusion of the tutorial.

"Title" Topic List: 
The definition of matrices Matrices The sum and product of matrices Determinants Matrices that are two dimensional Matrices that are three dimensional A rank of a matrix Linear systems and the rank of a matrix Matrix Inverse Definition of the inverse of a matrix Cramer’s Rule Matrix Reduction Definition of equivalent matrices 
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