The ab notation makes it clear that not and or are dependent on one another and we can therefore not use them as simultaneous indefinables. Same objections in the case of apparent variables to

the usual old

indefinables, as in the case of molecular functions. The application of the ab notation to apparent variable propositions becomes clear if we consider that, for instance, the proposition “for all x, φx” is to be true when φx is true for all x's and false when φx is false for some x's. We see that some and all occur simultaneously in the proper apparent variable notation.

Ts-201a2,a7