Key SequenceNotationNew Conceptsusing domain knowledge: skinningdisplacement mapLinear SystemsSystems of Linear Equationsproblems with zerosquare matrixDiagonal Matrixupper-triangular matriciesElimination MatriciespivotingLU-Factorizationpermutation matriciessparsityImportant Results / Claimslinear systems with diagonal matriciesQuestionsInteresting Factoids