# 1999/3/27

#=======================#
# perceptual unit (pit) #
# knowledge unit (knit) #
# ecr hierarchy         #
# classify              #
# identify              #
#=======================#

# Reference:
# David Kelley, "The Evidence of the Senses",
# Louisiana State University Press, 1986.


#-----#
# pit #
#-----#
My perceptual unit (pit) is what Kelley calls a
perceptual judgment.  Using Kelley's terminology,
a pit has the format

	this_i isa kind_j
	this_i has property_k

where

	this_i 		i = 1, 2, ...
	kind_j 		j = 1, 2, ...
	property_k	k = 1, 2, ...

are the

	present perceived entities
	past abstract types
	past abstract attributes


#------#
# knit #
#------#
My knowledge unit (knit) consists of the pits plus
the conceptual judgments

	kind_j isa concept_m
	property_k isa concept_n
	concept_p isa concept_q

using the higher level concepts

	concept_n	n = 1, 2, ...

A knit may also include other judgments, e.g. definitions:

	concept_p is concept_q with differentia

A knit is denoted by a knit name (kname).


#------------------------------------------#
# entity-characteristic-relation hierarchy #
#------------------------------------------#
Defining "relation" to be the concept which subsumes
all judgments, a knit can be visualized as an
entity-characteristic-relation hierarchy.
For example, using the higher level concepts

	existent, entity, characteristic, relation
	
we have

	existent
	    entity
		kind_1
			this_1
			...
		...
	    characteristic
		property_1
		...
	    relation
		[this_1 has property_1]
		...

The "isa" judgments determine the hierarchy structure,
and are not explicitly shown under relation.  Any other
judgments are explicitly shown.

A particular ecr hierarchy is denoted by a view name

	at view = vname


#----------#
# classify #
# identify #
#----------#
My "classify" is the name of the human action that
produces "isa" judgments.

My "identify" is the name of the human action that
produces all judgments, i.e., knowledge.