BUTLASTN_CONV : conv

- STRUCTURE
- SYNOPSIS
- Computes by inference the result of dropping the last n elements of a list.
- DESCRIPTION
- For any object language list of the form “[x0;...x(n-k);...;x(n-1)]” , the result of evaluatingis the theorem
BUTLASTN_CONV “BUTLASTN k [x0;...x(n-k);...;x(n-1)]”

|- BUTLASTN k [x0;...;x(n-k);...;x(n-1)] = [x0;...;x(n-k-1)]

- FAILURE
- BUTLASTN_CONV tm fails if tm is not of the form described above, or k is greater than the length of the list.

HOL Kananaskis-14