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Singular Matrix — from Wolfram MathWorld – A square matrix that does not have a matrix inverse. A matrix is singular iff its determinant is 0. For example, there are 10 singular (0,1)-matrices: The following …

Invertible matrices are very important in many areas of science. For example, decrypting a coded message uses invertible matrices (see the coding page). The …

I’m learning Linear Algebra using MIT’s Open Courseware Course 18.06. Quite often, the professor says "… assuming that the matrix is invertible …".

this page updated 21-feb-16 Mathwords: Terms and Formulas from Algebra I to Calculus written, illustrated, and webmastered by Bruce Simmons

where is the identity matrix. Courant and Hilbert (1989, p. 10) use the notation to denote the inverse matrix. A square matrix has an inverse iff the determinant …