[Blindmath] what math braille code is easier and most used?

[Susan Jolly]

I'd like to add to what Birkir wrote.  Nemeth braille math is also used in 
east Asia, including Indonesia and Thailand.  There is a wonderful book 
published by ON-NET and ICEVI that explains the details of Nemeth math and 
how to also teach a large number of math concepts to visually-impaired 
persons.  The teaching strategies were based on workshops attended by 
teachers from at least seven different countries.

The book is titled "Mathematics Made Easy For Children with Visual 
Impairment".
You can read an announcement here:
http://www.icevi.org/publications/MathBrochure.htm

Here is the page for ordering from Tower Press in the United States.  You 
may be able to order it elsewhere as well.
http://www.obs.org/page.php?ITEM=78

Sincerely,
Susan Jolly