avoid using "prop_logic.ML" and "sat_solver.ML" twice (the other occurrence being in "FunDef.thy");
this produces two copies of the same module, with separate references etc.
lcp paulson
norbert.schirmer@web.de schirmer
urbanc@in.tum.de urbanc
nipkow@lapbroy100.local nipkow
chaieb@chaieb-laptop chaieb
immler@in.tum.de immler
tsewell@rubicon.NSW.bigpond.net.au tsewell
tsewell@nicta.com.au tsewell