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2 be logical
Introductory Logic Terms, Lessons 1-10
Term | Definition |
---|---|
formal logic | deals with the proper modes of reasoning |
informal logic | deals with operations of thinking that are indirectly related to reasoning |
logic | the science and art of reasoning well |
induction | reasoning with probability from examples or experience to general rules |
deduction | reasoning with certainty from premises to conclusions |
Law of Identity | If a statement is true, then it is true. |
Law of Noncontradiction | A statement cannot be both true and false. |
Law of Excluded Middle | Any statement is either true or false. |
ambiguous | has more than one definition, more than one possible meaning |
vague | extent is unclear |
relationships | one term has this with another term, is shown when defined properly |
persuasive definition | definition to influence attitudes and emotions of an audience |
theoretical definition | defines a concepts in scientific or philosophical terms, alludes to a theory about the term |
precising definition | not found in a dictionary; situational; seeks to make more precise what was previously vague or fuzzy (Rylee's sandwich) |
stipulative definition | when a new word is invented or an existing word is applied in a new way (emoji) |
term | a concept that is expressed precisely in words |
definition | a statement that gives the meaning of a term |
lexical definition | shows relationships or reduces ambiguity by providing a single, established meaning of a term; the one in the dictionary |
species | more specific, narrow, or concrete than the original term and is included by it |
genus | more general, broad, or abstract than the original term and includes it |
mutually exclusive | groups that do not overlap |
exhaustive | no other types exist |
intension | specific; sum of all the common attributes denoted (or represented) by the term |
extension | broad; sum of all the individual objects described by the term |
statement | a sentence that is either true or false |
Questions, commands, and nonsense sentences are | NOT statements because they do not have a truth value. |
self-supporting statements | a statement whose truth value can be determined from the statement itself |
tautology | a statement that is true by logical structure |
I believe frosted lemonades are the absolute best drinks. | an example of a self-report |
Jesus is the Son of God, OR He is not the Son of God. | an example of a tautology |
self-contradiction | a statement that is false by logical structure |
Jesus is the Son of God, AND He is not the Son of God. | an example of a self-contradiction |
All triangles are 4 sided figures. | an example of a statement that is false by definition |
All triangles are 3 sided figures. | an example of a statement that is true by definition |
supported statement | a statement whose truth value depends on evidence or information from outside itself |
Some ways to determined the truth value of a statement is from | authority, experience/observation, or deductive reasoning. |
consistent | when two statements can both be true at the same time |
implication | when the truth of one statement implies the other (All of the grass needs to be watered, therefore some of the grass needs to be watered) |
Some S is P does NOT imply that | Some S is NOT P. |
logically equivalent | when to statements each imply each other |
independent | when the truth or falsity of one statement has no effect on the truth or falsity of another statement |
real disagreement | an actual inconsistency between two statements; they cannot both be true at the same time |
apparent disagreement | a difference of opinion or perception |
verbal disagreement | a misunderstanding due to differing definitions for one or more words |