do not declare TPTP built-ins, e.g. $true
--- a/src/HOL/Tools/Sledgehammer/sledgehammer_atp_translate.ML Mon May 02 22:52:15 2011 +0200
+++ b/src/HOL/Tools/Sledgehammer/sledgehammer_atp_translate.ML Mon May 02 23:01:22 2011 +0200
@@ -811,6 +811,7 @@
fun should_declare_sym type_sys pred_sym s =
not (String.isPrefix bound_var_prefix s) andalso s <> "equal" andalso
+ not (String.isPrefix "$" s) andalso
(type_sys = Many_Typed orelse not pred_sym)
fun add_combterm_syms_to_decl_table type_sys repaired_sym_tab =