[Blindmath] Nemeth equivalent for Logical Not

[George Bell]

Speaking from a visual perspective, the sign is rather like the sideways view a tap. (or what I think you guys call a faucet).  It's a horizontal line, with a vertical line about half the length dropping down on the right.

Unfortunately I cannot see it on my American keyboard, but on a British keyboard, it is the key immediately left of the number 1 on the top row.  (Which is the Tilde on a US keyboard)

For those who know Unicode it is 00AC.

George.

-----Original Message-----
From: Blindmath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of Rose
Sent: 19 December 2013 19:33
To: Blind Math list for those interested in mathematics
Subject: Re: [Blindmath] Nemeth equivolent for Logical Not

Hi,
I think it depends on how the logical not sign is represented in print. 
If it is represented as a tilde ~ then it would translate as that ... 
dots (4, 156), but sometimes the print will use what looks like "half turnstile"  which looks to me like a left pointing arrow with only a straight left lower barb, this symbol is not in the Nemeth code, but I have seen it transcribed as the arrow it looks like dots (1246, 6, 1256) or simply as the "shape indicator n" dots (1246, 1345).

My guess is that the print has it as what looks like a "half turnstile" 
and duxbury is not translating it correctly. I hope this helps.


On 12/19/2013 12:28 PM, Kevin Fjelsted wrote:
> I would like clarification on the Nemeth contraction/symbol for producing the logical not " ".
> The Latex equivalent is \lnot.
> I cannot find any reference for the Nemeth. Duxbury appears to translate latex \lnot as dots 4-3456.
> Is this correct?
> If so, where is this  contraction listed in the Nemeth reference?
> -Kevin
>
>
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