E0-ORD-_lt_.html -- ACL2 Version 6.3

### E0-ORD-<

the old ordering function for ACL2 ordinals

    Major Section:  ACL2-BUILT-INS

See o< for the current new ordering function for ACL2 ordinals.

The functions `e0-ordinalp` and `e0-ord-<` were replaced in ACL2 Version_2.8 by `o-p` and `o<`, respectively. However, books created before that version used the earlier functions for termination proofs; the old functions might be of use in these cases. To use the old functions in termination proofs, include the community book `books/ordinals/e0-ordinal` and execute the event `(set-well-founded-relation e0-ord-<)` (see set-well-founded-relation). For a more thorough discussion of these functions, see the documentation at the end of community book `books/ordinals/e0-ordinal.lisp`.