What one may come to know

Analysis 64 (2):95–105 (2004)
The general verificationist thesis says that What is true can be known or formally: φ → ◊Kφ VT Fitch's argument trivializes this principle. It uses a weak modal epistemic logic to show that VT collapses truth and knowledge, by taking a clever substitution instance for φ: P ∧ ¬KP → ◊ K(P ∧ ¬KP) Then we have the following chain of three conditionals (a) ◊ K(P ∧ ¬KP) → ◊ (KP ∧ K¬KP) in the minimal modal logic for the knowledge operator K, (b) ◊ (KP ∧ K¬KP) → ◊ (KP ∧¬KP) in the modal logic T, and finally (c) ◊ (KP ∧¬KP) → ⊥ in the minimal modal logic for
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DOI 10.1111/j.1467-8284.2004.00467.x
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References found in this work BETA
Neil Tennant (2002). Victor Vanquished. Analysis 62 (2):135–142.
Heinrich Wansing (2002). Diamonds Are a Philosopher's Best Friends. Journal of Philosophical Logic 31 (6):591-612.

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Adam Rieger (2015). Moore's Paradox, Introspection and Doxastic Logic. Thought: A Journal of Philosophy 4 (4):215-227.
Patrick Allo (2013). The Many Faces of Closure and Introspection. Journal of Philosophical Logic 42 (1):91-124.

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