Intuitionist logic — subsystem of, extension of, or rival to, classical logic?

Philosophical Studies 53 (1):147 - 151 (1988)
Strictly speaking, intuitionistic logic is not a modal logic. There are, after all, no modal operators in the language. It is a subsystem of classical logic, not [like modal logic] an extension of it. But... (thus Fitting, p. 437, trying to justify inclusion of a large chapter on intuitionist logic in a book that is largely about modal logics).
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DOI 10.1007/BF00355682
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A. Heyting (1956). Intuitionism. Amsterdam, North-Holland Pub. Co..

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