ers as names for features and functions.

The example that Edelman gives (1988, Fig. 10.5, p. 194) involves sets of
stimulus patterns that can be described in terms of the three features
&quot;round&quot; 'u', &quot;doubly outlined&quot; 'v', and &quot;centrally dark&quot; 'w'.  We may
regard these simple features as logical propositions u, v, w : X -&gt; B.
The target concept Q is one whose extension is a polymorphous set Q,
the subset Q of the universe X where the complex feature q : X -&gt; B
holds true.