Leibniz-Clarke Correspondence, Brain in a Vat, Five-Minute Hypothesis, McTaggart’s Paradox, etc. Are Clarified in Quantum Language

Recently we proposed “quantum language” (or, “the linguistic Copenhagen interpretation of quantum mechanics”), which was not only characterized as the metaphysical and linguistic turn of quantum mechanics but also the linguistic turn of Descartes = Kant epistemology. We believe that quantum language is not only the scientific final goal of dualistic idealism but also the language in which science is written. Hence there is a reason to want to clarify, from the quantum linguistic point of view, the following problems: “brain in a vat argument”, “the Cogito proposition”, “five-minute hypothesis”, “only the present exists”, “Copernican revolution”, “McTaggart’s paradox”, and so on. In this paper, these will be discussed in quantum language. And we clarify that these are not propositions in quantum language. That is, these are metaphysical and not scientific. Also, we emphasize that Leibniz’s relationalism in Leibniz-Clarke correspondence should be regarded as one of the most important parts of the linguistic Copenhagen interpretation of quantum mechanics.