...Puzzle
Adapted slightly from Chapter I of Rayond Smullyan's (1992) Gödel's Incompleteness Proofs (Oxford, UK: Oxford University Press).
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
...iff
Traditional abbreviation in logic for `if and only if.'
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

Selmer Bringsjord
Fri Jun 27 10:54:39 EDT 1997