/[escript]/trunk/doc/user/diffusion.tex
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revision 155 by jgs, Wed Nov 9 02:02:19 2005 UTC revision 565 by gross, Mon Feb 27 00:04:17 2006 UTC
# Line 162  new class which we will call \class{Helm Line 162  new class which we will call \class{Helm
162  is described using the coefficients $\kappa$, $\omega$, $f$, $\eta$,  is described using the coefficients $\kappa$, $\omega$, $f$, $\eta$,
163  $g$ rather than the general form given by \eqn{EQU.FEM.1}.  $g$ rather than the general form given by \eqn{EQU.FEM.1}.
164  Python's mechanism of subclasses allows us to do this in a very simple way.  Python's mechanism of subclasses allows us to do this in a very simple way.
165  The \Poisson class of the \linearPDEsPack module,  The \Poisson class of the \linearPDEs module,
166  which we have already used in \Chap{FirstSteps}, is in fact a subclass of the more general  which we have already used in \Chap{FirstSteps}, is in fact a subclass of the more general
167  \LinearPDE class. That means that all methods (such as the \method{getSolution})  \LinearPDE class. That means that all methods (such as the \method{getSolution})
168  from the parent class \LinearPDE are available for any \Poisson object. However, new  from the parent class \LinearPDE are available for any \Poisson object. However, new

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