src/HOL/Tools/Sledgehammer/sledgehammer_commands.ML

   if is_prover_supported ctxt name andalso is_prover_installed ctxt name then SOME name
   else remotify_prover_if_supported_and_not_already_remote ctxt name
 
 (* The first ATP of the list is used by Auto Sledgehammer. *)
 fun default_provers_param_value mode ctxt =
-  [cvc4N, vampireN, veritN, eN, spassN, z3N, zipperpositionN]
+  [cvc4N, vampireN, veritN, eN, spassN, z3N, zipperpositionN] \<comment> \<open>see also \<^system_option>\<open>sledgehammer_provers\<close>\<close>
   |> map_filter (remotify_prover_if_not_installed ctxt)
   (* In "try" mode, leave at least one thread to another slow tool (e.g. Nitpick) *)
   |> take (Multithreading.max_threads () - (if mode = Try then 1 else 0))
   |> implode_param