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Published online by Cambridge University Press: 22 January 2016
I have introduced in my paper [1] a formalism for lower order predicate logics in which any sequence of variables and brackets (‘[’ and ‘]’) can be regarded as a meaningful (well-formed) sentence. Also, in my paper [2], I have introduced another formalism of the same kind for a certain kind of predicate logics of higher order. Can we introduce a formalism of the same kind properly for sentence logics too? Since sentence logics can be regarded as a sub-system of predicate logics, we are apt to consider that our device introduced in [1] works well for sentence logics too.