the power of logic "Definitions" Flashcards
what makes a word vague ?
if there are borderline cases in which there is no way to determine whether the word applies
what important role does definitions play in arguments ?
can be used to clear up ambiguity and make vague terminology more precise
what is the extension of a term ?
it consists of the set of things to which the term applies .
what is the intension of a tear ?
consists in the properties a thing must have to be included in the terms extension.
what is an extensional definition ?
specifies the meaning of a term by indicating the set of things to which the term applies
what are the two basic types of extensional definitions ?
nonverbal(ostenssive) / and verbal
how do you give an ostensive definition?
one specifies the meaning of a term by pointing to objects in its extension.
what its an enumerative definition ?
name the members of the extensions individually.
what are the two ways a definition may be ?
partial or complete
what makes and extensional definition complete ?
if all members of the extension is listed .
what is another kind of verbal extensional definition ?
subclass
what is a subclass ?
the members of the extension in groups
why can some terms not be defined extensionally ?
because their extensions are empty
what does an intensional definition do ?
specifies the meaning of a term by indicating the properties a thing must have to be included in the terms extension
what does it mean for lexical definitions to have truth values ?
it means they are either true or false