@friday@saxarona I see some formatting when viewing on quoto.org although it is plaintext, crazy spacing, and no nice font handling. I do see the symbols for \wedge and \implies. Of course, there is no deduction by modus ponens if only A is asserted to be true.
@Satrofu @saxarona @friday
A^B => C, ~C |- ~( A ^ B)
easy enough with truth table, just like modus ponens is. (Classical truth value semantics)