شوية نظريات زي اللي جت ف الميد تيرم
• If A is invertible  matrix then (A^-1) is invertible
• If A , B are both n×n invertible  matrix , then AB is invertable
• If A is invertible  matrix  , Then (A^T) is invertible
• If AB=I and BA=I ,then we say B is inverse  of A
• For any square matrix B with real number elements, B +(B^T) is a symmetric matrix,
• The sum of two symmetric matrices gives a symmetric matrix as result.
• If A is invertable Symmetric Matrix then
(A^-1) is Symmetric
• If A is invertable Symmetric Matrix then (A(A^T)) is invertible

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