Logical Notions !

Tarski: "Let me tell you in advance that in answering the question 'What are logical notions?' what I shall do is make a suggestion or proposal about a possible use of the term 'logical notion'. This suggestion seems to me to be in agreement, if not with all prevailing usage of the term 'logical notion', at least with one usage which actually is encountered in practice. I think the term is used in several different senses and that my suggestion gives an account of one of them." (p.145)

The theory of logical notions as presented here by Tarski is not something in the mainstream. This theory does not appear in any logical textbook.

The expression “logical notions” is not standard. A more standard way of speaking would be “logical concepts”. And if we have a look at a textbook of logic and/or an encyclopedia, we will find as basic “stuffs” related to logic, things like connectives, truth-tables, quantifiers, variables, constants, proof, inference, deduction, completeness, incompleteness.