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quantification| In logic, specification of quantity or number. There are two main quantifiers: the universal quantifier (‘For all x ...’) and the existential quantifier (‘For at least one/some x ...’). Either of these quantifiers can be defined in terms of the other plus negation – just as ‘some’ can be defined as ‘not all’ in everyday speech. |
| The quantifier shift fallacy is that of arguing from ‘Every nice girl loves a sailor’ to ‘At least one sailor is loved by every nice girl’. The latter implies, but is not implied by, the former. |
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