The question arises how can one prop. (or function) stand occur is in another prop.? The This can only be by its The prop. or function itself can't possibly stand in relation to the other symbols. It must therefore be that we For this reason we must introduce functions as well as
names
terms
at once in our general form of a prop.; explaining what is meant[.|,] by assigning meaning to the fact that the names stand between the |, & that the function stands on the left of the names.