MediumLinear systems

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.4 Matrices and Linear Equations, #19 · Linear Algebra · Linear systems

… is singular when the columns of … are ______

$A u = d$ is singular when the columns of $A$ are ______.
A solution exists if the right side $d$ is ______. In this solvable case the number of solutions is ______.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.4 Matrices and Linear Equations, #19

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