Jon AS, Thank you for emphasizing the fact that Peirce's only comments in favor of the scroll came before June 1911. In Peirce's writings after that date, the scroll is "equivalent" to a nest of two negations. In mathematics and logic, equivalence means freely interchangeable in all contexts without any change in meaning. Other people may choose to use a scroll for any purpose they please, but their choices have no effect on the logic or on anything Peirce wrote. John
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