bijnasinguliere
Bijnasinguliere is a Dutch term used in mathematics and numerical analysis to describe objects that are almost but not exactly singular. In common usage it refers especially to matrices or linear systems that are close to losing full rank, or to transformations that are nearly degenerate. The term highlights the practical instability that arises when an object is near the threshold between well-posed and ill-posed behavior.
For matrices, a near-singular (bijna-singuliere) matrix has a determinant close to zero and, more robustly, a
Near-singularity also appears in the context of Jacobians and differential maps. If the Jacobian of a function
Typical examples include small perturbations of a full-rank matrix that reduce its determinant or a Jacobian
See also: singular value decomposition, ill-conditioning, Moore-Penrose pseudoinverse, regularization, Jacobian.