ACL2-PC_colon__colon_NX.html -- ACL2 Version 6.3

### ACL2-PC::NX

(atomic macro) `` move forward one argument in the enclosing term

    Major Section:  PROOF-CHECKER-COMMANDS

    Example and General Form:
    nx

For example, if the conclusion is `(= x (* (- y) z))` and the current subterm is `x`, then after executing `nx`, the current subterm will be `(* (- y) z)`.

This is the same as `up` followed by `(dive n+1)`, where `n` is the position of the current subterm in its parent term in the conclusion. Thus in particular, the `nx` command fails if one is already at the top of the conclusion.

See also `up`, `dive`, `top`, and `bk`.