@TechReport{	  it:2015-011,
  author	= {Ali Dorostkar and Maya Neytcheva and Stefano
		  Serra-Capizzano},
  title		= {Schur Complement Matrix and its (Elementwise)
		  Approximation: A Spectral Analysis Based on {GLT}
		  Sequences},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Scientific Computing},
  year		= {2015},
  number	= {2015-011},
  month		= mar,
  abstract	= {Using the notion of the so-called \textit{spectral symbol}
		  in the Generalized Locally Toeplitz (GLT) setting, we
		  derive the GLT symbol of the sequence of matrices $\{A_n\}$
		  approximating the elasticity equations. Further, as the GLT
		  class defines an algebra of matrix sequences and Schur
		  complements are obtained via elementary algebraic operation
		  on the blocks of $A_n$, we derive the symbol
		  $f^{\mathcal{S}}$ of the associated sequences of Schur
		  complements $\{S_n\}$ and that of its element-wise
		  approximation. }
}