refer to theory instead of low-level tsig; use Thm.full_prop_of instead of Thm.prop_of; tuned use of map/filter/fold;
refer to theory instead of low-level tsig;
use Thm.full_prop_of instead of Thm.prop_of;
tuned use of map/filter/fold;

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