# null space

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## null space

[′nəl ′spās]
(mathematics)
For a linear transformation, the vector subspace of all vectors which the transformation sends to the zero vector. Also known as kernel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Where [P.sub.NS.sup.(i)] is the projection matrix of the nullspaces of class i and P is the projection matrix of the subspace of the total scatter matrix.
[A.sub.n]) [(A).sup.T] Trace of A [(A).sup.H] The right-hand nullspace of A [(A).sup.-1] A block-diagonal matrix with the i-th diagonal block specified by [A.sub.i] where n is an integer Table 2.
Then we can obtain [[bar.v].sub.l], from the nullspace of [Q.sup.T][[bar.H].sub.l] [member of] [R.sup.3 x 4].
To this end, P must be chosen as an oblique projection with the property that when its nullspace Z is A-invariant, so is its range [[??].sup.[perpendicular to]].
h) If the nullspace of [B.sup.T] is an invariant subspace of A, then M = 0, i.
WHITE, Substructuring methods for computing the nullspace of equilibrium matrices, SIAM J.
Moreover, deriving a conforming approximation of the nullspace (2.7) is difficult, which leaves the saddle-point problem (2.5) as the preferred setting for the constrained minimization.
As it will be seen in Section 2, the use of algebraic methods will allow us to formulate the problem of inversion in terms of the computation of the nullspace of a Sylvester matrix of order l and rank l - 1, a task which for accuracy reasons is carried out by using the singular value decomposition.
However, block l-l =1-1 contains the grad-div operator [nabla][nabla]*, whose nullspace consists of divergence-free functions.
Finally, [rho](A) is the spectral radius of [A,.sup.t] denotes the transpose, Ker is the nullspace, and Im is the range.
This eigenvalue problem has N finite solutions [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] and m - N indeterminate eigenvalues corresponding to eigenvectors [{[e.sub.i].sup.m.sub.i=N+1] spanning the nullspaces of [bar.C] and [bar.CA].

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