ERRATA FOR ISABELLE MANUAL

 ** THM : BASIC INFERENCE **

 Pure/tactic/lift_inst_rule: now checks for distinct parameters (could also

 compare with free variable names, though).  Variables in the insts are now

 lifted over all parameters; their index is also increased.  Type vars in

 the lhs variables are also increased by maxidx+1; this is essential for HOL

 examples to work.

 ** THEORY MATTERS (GENERAL) **

 Definitions: users must ensure that the left-hand side is nothing

 more complex than a function application -- never using fancy syntax.  E.g.

 never

 >     ("the_def",      "THE y. P(y) == Union({y . x:{0}, P(y)})" ),

 but

 <     ("the_def",      "The(P) == Union({y . x:{0}, P(y)})" ),

 Provers/classical, simp (new simplifier), tsimp (old simplifier), ind

 ** SYSTEMS MATTERS **

 explain make system?  maketest

 expandshort