Chapter 3 Review Flashcards
What is the definition of logic?
Logic is the science of right thinking
What are the two main branches of logic
formal or “minor” logic; material or “major” logic
Define truth
correspondence to reality
Define validity
when the conclusion follows logically from the premises
Define soundness
when all the premises are true and the argument is valid
What is the purpose of formal logic?
to lead us from one truth to another
List the three acts of the mind involved in logic and their corresponding verbal expressions.
Simple apprehension - term; judgement - proposition (or statement); deductive inference - syllogism
What are the three things associated with simple apprehension?
sense perception; mental image; concept
Give a definition of sense perception
the act of seeing or hearing or smelling or tasting or touching
Give the definition of mental image
the image of an object formed in the mind as a result of a sense perception of that object
Give the definition of simple apprehension
an act by which the mind grasps the concept or general meaning of an object without affirming or denying anything about it
List the three acts of the mind involved in logic and their corresponding verbal expressions.
Simple apprehension - term; judgement - proposition (or statement); deductive inference - syllogism
Name the five elements represented by a concept
substance, material, living, sentient, rational
What is the extension concept ‘man’?
all the men there are, ever were, and ever will be
How do you find the comprehension of a concept?
List the notes (or Porphyrian Tree categories)
What is the relationship between extension and comprehension?
the greater the comprehension a concept has, the less extension it has; and the more extension it has, the less comprehension
What does sentient mean?
it has senses such as sight, hearing, etc.
What does material mean?
it has a body, rather than being purely spiritual - like angels
What does substance mean?
It is something rather than nothing
What are the two properties of terms
signification and supposition
Give a definition of term
a word or group of words that verbally expresses a concept
What are three ways terms can be divided according to signification?
univocal terms; equivocal terms; analogous terms
What are univocal terms?
terms that have exactly the same meaning no matter when or how they are used
What are equivocal terms?
terms that, although spelled and pronounced exacly alike, have entirely different and unrelated meanings
What are analogous terms?
terms that are applied to different things, but have related meanings
What is material supposition?
the use of a term according to its verbal existence
What is logical supposition?
the use of a term according to its mental or logical existence
What is real supposition?
the use of a term according to its real or actual existence
What are the three aspects of logic?
apprehension, judgment, and deductive inference
