Double Negation Law

[Connie Stone]

What would be the braille symbols for the two long lines with the line down on the right side? The only things I find similar or when they or more vertical, a sign of grouping or possibly an arrow but that would be a comparison sign. These are used as operation signs. This happens to be the second book I am transcribing that uses this symbol. Thank you.

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[Michael Gunner]

Hi Connie,

As luck would have it, I came across this same symbol last year. There was an Ask An Expert question in which Lindy addressed this same symbol. I will copy the answer below.

"The "not" sign is not in the original Nemeth Code. This negation sign is common and has been under discussion in the BANA Nemeth committee. Perhaps a new symbol will be proposed. In the meantime, the advice I have received is that the transcriber should devise a symbol that is in keeping with usage, and to explain in a transcriber's note. In this case, I suggest a 2-cell "dot 4" symbol since the more common symbol of ~p (tilde p) is a dot-4 symbol. Note that, listed in Appendix B of the Nemeth Code, there are 71 symbols beginning with a dot 4 so choose your symbol carefully since you cannot use one which already has a meaning. As luck would have it, (4, 1456) is available! I suggest using that."

Unfortunately, the Nemeth Code has not yet devised a symbol to represent the logical "not" sign. So I recommend the advise from Lindy.

Thanks

Mike

• This reply was modified 3 days, 7 hours ago by Michael Gunner.

[Connie Stone]

Thank you for your reply.

[Lindy Walton]

Lindy here ...

This is illustrated in Section 13.1.10 of the Nemeth lesson manual under the heading "Transcriber-Devised Symbols." The errata to Lesson 13 has updated this section. See attached file.

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[Connie Stone]

Thank you Lindy. Good information!

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