Solving the Ross and Prior Paradoxes. Classical Modal Calculus

Resolving the Ross and Prior paradoxes proved to be a difficult task. Its first two stages, involving the identification of the true natures of the implication and truth values, are described in the articles Solving the Paradox of Material Implication – 2024 and Solving Jörgensen's Dilemma – 2024. This article describes the third stage, which involves the discovery of missing modal operators and the Classical Modal Calculus. Finally, procedures for solving both paradoxes are provided.