No more makeatletter/other

Crypt_imp_keysFor: version of Crypt_imp_invKey_keysFor for shared keys

The dtac was discarding information, though apparently no proofs were hurt

Fixed bug in inst_split.

improved big_rec_name lookup;

Updated comments. A bug causes MLWorks to use much more storage than necessary

Rationalized error handling: if low-level tactic (depth_tac) cannot accept the goal then it raises exception TRANS. Top-level tactics (blast_tac) generate warnings and then fail immediately.

Tuned function mk_cntxt_splitthm. Fixed bug which caused split_tac to fail when (Const ("splitconst", ...) $ ...) was of function type.

Removed "(ALL x:f``A. P x) = (ALL x:A. P(f x))", "(EX x:f``A. P x) = (EX x:A. P(f x))", again, because they were already there and added "(UN x:f``A. B x) = (UN a:A. B(f a))" "(INT x:f``A. B x) = (INT a:A. B(f a))" instead.

Redesigned the decision procedures for (Abelian) groups and commutative rings.

Added > "(? x : f `` A. P x) = (? a:A. P(f a))" > "(! x : f `` A. P x) = (! a:A. P(f a))"

merge_refs: check for different versions of theories;

export read_raw_typ;

fixed record parser;

improved record syntax;

made SML/NJ happy;

added thin_refl to hyp_subst_tac

refer to $ISABELLE_HOME/src;

structure BasisLibrary;

renamed to use.ML;

Redefine 'use' command in order to support path variable expansion, automatic suffix generation, and symbolic input filtering (if required).

adapted to new Use, File structs;

added path variables;

File system operations.

moved old file stuff from library.ML to Thy/browser_info.ML; subdir_of no longer infix;

added file.ML, use.ML; removed symbol_input.ML;

tuned warning msg;

major cleanup; removed several obsolete functions; moved file stuff to Thy/file.ML;

moved 'latex' from library.ML to goals.ML;

tuned prths;