We consider linear systems arising from the use of the finite element method for solving scalar linear elliptic problems. Our main result is that these linear systems, which are symmetric and positive ...

Kengo Kato, Solving l₁ Regularization Problems With Piecewise Linear Losses, Journal of Computational and Graphical Statistics, Vol. 19, No. 4 (December 2010), pp. 1024-1040 ...