In linear algebra, a Hessenberg matrix is a special kind of square matrix, a type of a triangular matrix. The Upper Hessenberg matrix has zero entries below the first subdiagonal, and theLlower Hessenberg matrix has zero entries above the first superdiagonal

The Heisenberg Matrix iPad app enables the entry of 2x2, 3x3 and 4x4 matrices, checks for matrix entry validity and calculates and displays the resulting Lower Heisenberg Matrix and Upper Hessenberg Triangular Matrix.

The Heisenberg Matrix iPhone app enables the entry of 2x2 and 3x3 matrices, checks for matrix entry validity and calculates and displays the resulting Lower Heisenberg Matrix and Upper Hessenberg Triangular Matrix.