Suppose that minimal logic proves that $\psi_1\leftrightarrow\psi_2$, does it follow that minimal logic proves $\varphi[\theta/\psi_1]\leftrightarrow\varphi[\theta/\psi_2]$?
2026-03-27 05:39:24.1774589964
Does Substitution of Logical Equivalents hold for minimal logic?
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