The_Expansion_of_ENDP_in_the_Induction_Step__lparen_Step_1_rparen_.html -- ACL2 Version 6.3

## The Expansion of ENDP in the Induction Step (Step 1)

    Subgoal *1/2
    (IMPLIES (AND (NOT (NOT (CONSP A)))
                  (EQUAL (APP (APP (CDR A) B) C)
                         (APP (CDR A) (APP B C))))
             (EQUAL (APP (APP A B) C)
                    (APP A (APP B C)))).

The bold text is the instantiated definition of `ENDP`.

Now click on the link above to simplify (NOT (NOT (CONSP A)))