The logical conditional p -> q may be interpreted by a statement couched in the words of the everyday language, say, materialiter, or by a concept(ual complex) that "considers all four rows of its truth table as equilogical and equiempirical.
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Hjelmslev does not realise that change and stability are equilogical concepts. Change is the contradictory of stability = Stability is the contradictory of change.
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To commit the Phenomenal Error is to explain or describe either of two equilogical or equiempirical phenomena on the basis of or in terms of the other phenomenon.
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We show that the two models of extensional type theory, those given by the category of equilogical spaces and by the effective topos, are homotopical quotients of categories of 2-groupoids..
Source: wiktionary