The study of the meanings of the expressions of a language

A sentence that is true under any interpretation

An argument in which there is no interpretation under which the premisses are all true and the conclusion is false

Sentences that are true under exactly the same interpretations

The study of expressions of a language bare of their meanings

A set of sentences such that there is at least one interpretation under which all sentences of the set are true

An L1-structure for which the premisses of an argument are true but the conclusion is false

An expression that expresses membership of objects to a set

A sentence that is false under all interpretations

An argument where the set containing the negation of the conclusion and the premises is consistent

A set containing nothing but ordered pairs

Hint

Answer

An ordered pair containing 'D, I', where D is a non-empty set and I is a function of the set of all constants, sentence letters and predicate letters

The number of designators associated with a predicate

An assignment of a truth value to every sentence letter of L1

The occurrence of the smallest subsentence of a sentence that contains the connective

A collection of objects

A connective for which the truth-value of the compound sentence that it forms cannot be changed by replacing a subsentence with another subsentence of the same truth-value

A binary relation for which each element in the domain has only one pair

A set of L1-sentences such that there is a L1-structure for which all sentences are true

The study of language in use

An argument in English whose formalisation in L1 is valid

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