问题
When I import theory files which come with defined constants (for recursive functions or definitions) like f, how can I hide such a constant in the current theory file? In other words, I want to make sure that f is a free variable. I do not want to change the imported files.
回答1:
That is exactly the purpose of the hide_const command. E.g.,
hide_const f
will completely remove the defined constant f from the current context (and thus make it inaccessible). If you use
hide_const (open) f
instead, only the base name is hidden (i.e., f), but the qualified name (e.g., A.f if f was defined in theory A) still works.
There are similar commands for classes, types, and facts: hide_class, hide_type, and hide_fact. See also the Isabelle/Isar Reference Manual, page 105.
来源：https://stackoverflow.com/questions/16254465/how-to-hide-defined-constants