[Blindmath] Using minus signs before negative numbers

[Fontenot, Stacy L]

Good afternoon,
On page 6 of "An Introduction to Braille Mathematics" it shows the multipurpose indicator between the two minus signs.  I do not have any reference to this in the Nemeth Code, though.
Stacy

Stacy Fontenot
Certified Nemeth & Literary Braille Transcriber
Program for Visually Impaired
Department of Special Education Services, SAISD
San Antonio, TX 

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-----Original Message-----
From: Blindmath [mailto:blindmath-bounces at nfbnet.org] On Behalf Of Greg Aikens via Blindmath
Sent: Wednesday, April 22, 2015 12:53 PM
To: Blind Math list for those interested in mathematics
Subject: [Blindmath] Using minus signs before negative numbers

Hello everyone,
What/where is the rule that explains how to write a minus sign followed by a negative number? For example, in the expression 3 minus negative 5. I have found specific rules/examples for when the negative sign is superscript, but how would I write it when the negative sign is on the line with the numeral?

Thanks for your help.

-Greg