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Logic 1 Chapter 2

Memoria Press 2nd Edition for GRACE

Two properties of Simple Apprehension Comprehension and extension
Comprehension the completely articulated sum of the intelligible aspect of elements( or notes) represented by a concept
Sentient it has senses, such as sight, hearing
Material it has a body, rather than being purely spiritual
Substance it has something rather than nothing
Plato's tongue-in-cheek definition man is a "featherless biped"
Porphyrian Tree A diagram invented by third-century logician Porphyry, that breaks down complex concepts into simple concepts
Complex concept the concept before broken down by the tree
Simple concept the concept after broken down by the tree/ material, substance etc.
Rational Being able to distinguish between true and false; knowing right and wrong
Notes Simple concepts to define a complex concept
Extension The total number of individuals/things to which a concept extends or applies.
What is a material substance? It has a body. It is either living or nonliving.
How do we ask what is the comprehension of a concept? Ask the question "what is the concept?" What is a (man, animal, etc)?
How do we ask what is the extension of a concept? Ask the question, "To what does the concept 'man, etc' refer?"
What is the relationship between comprehension and extension? The greater the comprehension a concept has, the less extension it has; and the more extension it has, the less comprehension.
The essence of a thing. Comprehension
The things to which the essence of something is applied. Extension
How many notes does "animal" have? 4 notes: sentient, living, material, substance
How many notes does "man" have? 5 notes: rational, sentient, living, material, substance
How many notes does "chair" have? 2 notes: material, substance
Created by: ticherie03
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