In R670, Peirce said that the scroll is equivalent to a nest of two
negations. That means that any occurrence of one may be replaced by the
other without causing any change in the meaning.
In L231 and later
MSS, he did not mention or draw a scroll.
That doesn't mean you are
forbidden to draw a
Edwina, List,
uh, language is very inaccurate and tricky. I have made some mistakes in my previous post. I have to reformulate it all, paying attention to formulations. For example, "The class of tigers does physically exist" is perhaps not equivalent with "A tiger exists", but
"some tige
