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quantifier    
n. 数量词,量记号

数量词,量记号

quantifier
量词

quantifier
量词

quantifier
n 1: (logic) a word (such as `some' or `all' or `no') that binds
the variables in a logical proposition [synonym: {quantifier},
{logical quantifier}]
2: (grammar) a word that expresses a quantity (as `fifteen' or
`many')

An operator in {predicate logic} specifying for which
values of a variable a formula is true. Universally
quantified means "for all values" (written with an inverted A,
{LaTeX} \forall) and existentially quantified means "there
exists some value" (written with a reversed E, {LaTeX}
\exists). To be unambiguous, the set to which the values of
the variable belong should be specified, though this is often
omitted when it is clear from the context (the "universe of
discourse"). E.g.

Forall x . P(x) <=> not (Exists x . not P(x))

meaning that any x (in some unspecified set) has property P
which is equivalent to saying that there does not exist any x
which does not have the property.

If a variable is not quantified then it is a {free variable}.
In {logic programming} this usually means that it is actually
universally quantified.

See also {first order logic}.

(2002-05-21)


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  • Quantifiers | LearnEnglish - LearnEnglish - British Council
    We use quantifiers when we want to give someone information about the number of something: how much or how many Sometimes we use a quantifier in the place of a determiner: Most children start school at the age of five We ate some bread and butter We saw lots of birds We can use these quantifiers with both count and uncount nouns:
  • Quantifiers in English | A Lot Of, A Few, A Little, A Bit… - ESL Grammar
    We use quantifiers (A Lot Of, A Few, A Little, A Bit…) when we want to give someone information about the number of something: how much or how many Quantifiers form a sub-class under determiners They are adjectives or phrases that serve to answer two possible questions: 1 How many? 2 and How much?
  • Quantifiers in English with Examples • Englishan
    Quantifiers are words that tell us the amount or quantity of something in a sentence They help answer questions like “How much?” or “How many?” by giving information about the number or extent of a particular noun
  • QUANTIFIER Definition Meaning - Merriam-Webster
    The meaning of QUANTIFIER is one that quantifies How to use quantifier in a sentence
  • Quantifiers - Lingolia
    Common quantifiers include some any, much many, (a) few (a) little, lots of a lot of and enough Knowing when to use which quantifier can be tricky, so use Lingolia’s quick and easy examples to master the difference, then put your knowledge to the test in the exercises
  • Quantifiers | Learn English
    Quantifiers are words like ALL, EVERY, MOST, MUCH, SOME, ANY They are determiners that describe quantity in a noun phrase They answer the question 'How many?' or 'How much?' on a scale from none (0%) to all (100%)
  • Quantifiers with Countable and Uncountable Nouns - 7ESL
    Learn how to use quantifiers with countable and uncountable nouns in English with example sentences and ESL pictures One, each and every are examples of countable noun quantifiers one, two, three, four: These numerals are used to indicate the exact number of items
  • Quantifiers in English and How to Use Them - Love You English
    Quantifiers are words or phrases that indicate the amount or quantity of something They answer questions like “How much?” or “How many?” and can be used with both countable and uncountable nouns Quantifiers modify nouns and provide information about the number or amount of the noun in question
  • What are Quantifiers in English? - English Study Online
    A quantifier is a word or phrase which is used before a noun to indicate the amount or quantity: ‘Some’, ‘many’, ‘a lot of’ and ‘a few’ are examples of the quantifier Examples: There are some books on the desk





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