On Sunday, June 2, 2019 at 6:02:30 PM UTC+2, Norman Megill wrote: We have been calling [. A / x ]. ph "explicit" (because it has an explicit > substitution symbol) and "x = A -> ( ph <-> ps )" "implicit". See the > descriptions of ~ sbie and ~ sbcie. > I have no idea what "implicit substitution" means. I don't understand what any of the theorems containing constructions like x = A -> ( ph <-> ps ) is about.
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