made spass additional default prover

merged

Proved a new theorem: nat_to_nat2_inj

turned unsynchronized ref into synchronized var

merged

resolved conflict

record max lemmas used

Lazy evaluation with memoing (sequential version).

more official status of sequential implementations; tuned;

separate concurrent/sequential versions of lazy evaluation; lazy based on future avoids wasted evaluations;

added Task_Queue.depend (again) -- light-weight version for transitive graph; Future.join_results: record explicit dependency, detect direct task-task join cycles; Future.join_results: no change of interruptibility, allows to interrupt wait; added Future.worker_task; ThyInfo.schedule_futures: uninterruptible outer join;

handle Pattern.MATCH, not arbitrary exceptions; misc tuning, trying to reduce line length a bit;

more precise dependencies;

eliminated redundant parameters;

back to simple fold_body_thms and fulfill_proof/thm_proof (reverting a900d3cd47cc) -- the cycle check is implicit in the future computation of join_proofs;

avoid mixed l/r infixes, which do not work in some versions of SML;

tuned;

merged

explicitly Unsynchronized

Merged.

Propagation of mixins for interpretation; reactivated diagnostic command print_interps.

Archive registrations by external view.

Stricter test: raise error if registration generates duplicate theorem.

Explicit management of registration mixins.

Improved comments and api names.

eliminated dead code, redundant bindings and parameters; use === term operator, which is defined here; handle Type.TYPE_MATCH, not arbitrary exceptions; misc tuning and simplification;

misc tuning and simplification; be explicit about expressions involving infixes with non-obvious priorities; removed dead code; some attempts to recover basic Isabelle coding conventions;

eliminated dead code; eliminated redundant bindings; misc tuning;

eliminated dead code;

Sorts.of_sort_derivation: no pp here;