[dune-pdelab] Adaptive Grid Refinement Algorithms

[Dion Häfner]

Dear PDElab developers,

I implemented grid adaptivity into my module following example 7 from 
the PDElab-howto (src/course-examples/example07_adaptivity.hh), and 
everything works fine so far. However, there are two 'strategies' 
mentioned in the code to choose from:

//<<<10>>>Adapt the grid locally . . .
// with strategy 1:
Dune : : PDELab : : element_fraction ( eta , alpha , beta , eta_alpha , 
eta_beta , verbose ) ;
// or , alternatively , with strategy 2:
//Dune : :PDELab: : error_fraction ( eta , alpha , beta , eta_alpha , 
eta_beta , verbose );

So, I was wondering, how exactly the two strategies 'element fraction' 
and 'error fraction' differed. A quick google search did not yield any 
viable results, so I figured I would ask here, if someone could roughly 
sketch the difference between the two methods for me or recommend 
further literature, where the two strategies are explained.

Thank you in advance,
Dion Häfner
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