Major Section: THEORIES
ACL2 concludes its initialization
(boot-strapping) procedure by
defining the theory
ground-zero; see theories. In fact, this
theory is just the theory defined by
(current-theory :here) at the
conclusion of initialization; see current-theory.
Note that by executing the event
(in-theory (current-theory 'ground-zero))you can restore the current theory to its value at the time you started up ACL2.