A more recent practice is to use different non-logical symbols according to the application one has in mind. Therefore, it has become necessary to name the set of all non-logical symbols used in a particular application. This choice is made via a signature.The word language is sometimes used as a synonym for signature, but this can be confusing because "language" can also refer to the set of formulas.
A more recent practice is to use different non-logical symbols according to the application one has in mind Therefore, it has become necessary to name the set of all non-logical symbols used in a particular application This choice is made via a signatureThe word language is sometimes used as a synonym for signature, but this can be confusing because "language" can also refer to the set of formulas.