added notion of compactness; shortened proof of adm_disj; reorganized and cleaned up
added notion of compactness; shortened proof of adm_disj; reorganized and cleaned up

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle