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A square matrix X is periodic if Xn = I, the identity matrix, and its period is n.
If n = 1 then trivially, X = I, and Xk = I for all k.
However, if n > 1, then Xn = I but Xk is not I for any k < n.
Then Xna+b = Xna*Xb = Ia*Xb = Xb for all a. That is, X has a period of n.
It can be shown that X, X2, ... , Xn-1 and I are distinct matrices that form a Group
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What are the differences between an idempotent matrix and a generalized inverse of a matrix?
Idempotent Matrix:An idempotent matrix, A, is the specific periodic matrix (see note) where k=1, thus having the property A2=A (we can also say A.A=A).Inverse Matrix:Given a square matrix, A, its inverse is B if AB=BA.Note:A periodic matrix, A, has the property Ak+1=A where k is a positive integer. If k is the least positive integer for which Ak+1=A, then A is said to be of period k.
What is an idempotent give examples of idempotent matrix.?
An idempotent is a matrix whose square is itself. Specifically, A^{2}=A. For example the 2x2 matrix A= 1 1 0 0 is idempotent.
What is idempotent matrix?
An idempotent matrix is a matrix which gives the same matrix if we multiply with the same. in simple words,square of the matrix is equal to the same matrix. if M is our matrix,then MM=M. then M is a idempotent matrix.
What is a reduced matrix?
Reduced matrix is a matrix where the elements of the matrix is reduced by eliminating the elements in the row which its aim is to make an identity matrix.
How are the inverse matrix and identity matrix related?
If an identity matrix is the answer to a problem under matrix multiplication, then each of the two matrices is an inverse matrix of the other.
