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- To: KMP at MIT-MC
- From: JONL at MIT-MC (Jon L White)
- Date: Tue, 23 Sep 80 18:37:00 GMT
- Cc: (BUG LISP) at MIT-MC, NIL at MIT-MC
- Original-date: 23 SEP 1980 1437-EDT
Date: 23 September 1980 14:21-EDT
From: Kent M. Pitman <KMP at MIT-MC>
I guess I don't see this possible-digitness as being interesting.
. . . Just because you artificially cut things off at 26 or 36
doesn't really change anything.
I hope you're not serious. Just in case youve missed it
1) DIGITP as currently construed is not just a predicate, but extracts
the digits "weight" (in GLS's terminology);
2) "weight" extraction is a non-trivial operation (i.e., not just one
or two machine instructions on your typical machine) because "A" and
"a" are generally identified, and because the 36. digits are not
necessarily in numerical order;
3) the VAX's natural machine base is 16 and the usual presentation of
numbers in this base is a simple range-restriction of the 36-digit
notion. Do you think you have a better character standard?