BIM2Alaplacian

% -*- texinfo -*-
%
% @deftypefn {Function File} @
% {@var{A}} = BIM2Alaplacian (@var{mesh}, @var{epsilon})
%
% Builds the finite-element matrix for the 
% discretization of the LHS
% of the equation
% @iftex 
% @tex
% $ -div ( \varepsilon  \gamma  ( \nabla u )) = f $
% @end tex 
% @end iftex 
% @ifnottex
% - div (@var{epsilon} grad ( u )) = f
% @end ifnottex
% 
% where: 
% @itemize @minus
% @item @var{epsilon}: elemental values of an piece-wise constant function
% @end itemize
%
%
% @seealso{BIM2Arhs, BIM2Areaction}
% @end deftypefn