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/usr/share/liblouis/tables/nemeth.ctb is in liblouis-data 2.5.3-2ubuntu1.5.

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# liblouis: Nemeth Table for mathematics
#
#  Based on the Linux screenreader BRLTTY, copyright (C) 1999-2006 by
#  The BRLTTY Team
#
#  Copyright (C) 2004, 2005, 2006
#  ViewPlus Technologies, Inc. www.viewplus.com
#  and
#  JJB Software, Inc. www.jjb-software.com
#  All rights reserved
#
#  This file is free software; you can redistribute it and/or modify it
#   under the terms of the Lesser or Library GNU General Public License 
#  as published by the
#  Free Software Foundation; either version 3, or (at your option) any
#  later version.
# 
#  This file is distributed in the hope that it will be useful, but
#  WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
#  Library GNU General Public License for more details.
#
#  You should have received a copy of the Library GNU General Public 
#  License along with this program; see the file COPYING.  If not, write 
#  to
#  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
#  Boston, MA 02110-1301, USA.
#
#  Maintained by John J. Boyer john.boyer@jjb-software.com
# Updated 6-18-08 by Mike Sivill <mike.sivill@viewplus.com>

include chardefs.cti All character definition opcodes
include nemethdefs.cti

# Braille indicators
multind 56-6 letsign capsign
capsign 6
begital 46
endital 46-46
begbold 456
endbold 456-456
begcomp 456-346
endcomp 456-156

# Letters are defined in en-chardefs
# punctuation

prepunc " 236
postpunc " 356
prepunc ' 6-236
postpunc ' 356-3
postpunc , 6
always , 6-a
always # 35-2345 print number sign before number
decpoint . 46
hyphen - 36
postpunc . 456-256
endnum . 456-256
always . 256
postpunc ; 456-23
postpunc : 456-25
always ! 12346 factorial
always < a-5-13-a
always = a-46-13-a
always > a-46-2-a
postpunc ? 456-236
endnum % 4-356
always ~~ 4-156-5-4-156
always ~ 4-156
always & 456-12346
midnum * 4-16
always [ 4-12356
always ] 4-23456
always { 46-12356
always } 46-23456
always @ 4-1
always \\ 456-16
always | 1256
always $ 4-234
repeated \s 0
context ["\X25A1"]$d @1246-256-5
context ["\X25A0"]$d @1246-456-256-5
always \x00b0 45-46-16
always \x00B1 346-36

# semantic character pairs
always ^, 6
always ^; 56
always ^: 156
always ^. 46
always ^! 2346
always ^" 5
always ^' 3
always ^( 12356
always ^) 23456
always ^- 36
always ^_ 456
always ^< 126
always ^= 123456
always ^> 345
always ^% 146
always ^+ 346
always ^~ 45
always ^` 4
always ^& 12346
always ^$ 1246
always ^? 1456
always ^{ 246
always ^} 12456
always ^# 3456
always ^| 1256
always ^/ 34
always ^* 16
repeated ^1 a

# Function names and abbreviations
word acos 1-14-135-245-a
word antilog 1-1345-2345-24-123-135-1234-a
word arc 1-1235-14-a
word arccos 1-1235-14-14-135-234-a
word arg 1-1235-1245-a
word asin 1-234-24-1235-a
word atan 1-2345-1-135-a
word colog 14-123-135-1245-a
word cos 14-135-245-a
word cosh 14-135-234-a
word cot 14-135-2345-a
word coth 14-135-2345-125-a
word covers 14-135-1236-15-1235-245-a
word csc 14-234-14-a
word csch 14-234-14-125-a
word erf 15-1235-124-a
word inf 24-1345-124-a
word ln 123-1345-a
word log 123-135-1234-a
word max 135-1-1346-a
word min 134-24-1345-a
word sec 234-15-14-a
word sech 234-15-14-a
word sin 234-24-1345-a
word sinh 234-24-1345-125-a
word tan 2345-1-1345-a
word tanh 2345-1-135-125-a
word vers 1236-15-1235-234-a



# computer braille character sequences
compbrl :// URLs
compbrl www.
compbrl .com
compbrl .edu
compbrl .gov
compbrl .mil
compbrl .net
compbrl .org
compbrl .doc
compbrl .htm
compbrl .html
compbrl .tex
compbrl .txt
compbrl .gif
compbrl .jpg
compbrl .png
compbrl .wav
compbrl .tar
compbrl .zip

# pass 2 corrections

# get rid of base-line ind. after subscripts
pass2 @56[$d1-5]@5!$d *
# insert another superscript ind. on doube superscripts
pass2 @45[]$d@5-5 @45
#get rid of extra baseline inds.
pass2 @5-5 @5 pass2 @5-0 @0 pass2 @5-a @a pass2 @5-1b-15 @1b-15
# get rid rid of superscript ind. on prime sign
pass2 @45-3-5 @3
# Put 456 in mixed numbers
pass2 $d[]@1456 @456
pass2 @456-1456!$s3-8[]@3456 @456
# Put number sign on numbers after spaces
pass2 @a[]$d @3456
pass2 @0[]$d @3456
pass2 @1b-12[]$d @3456
pass2 @a-0 @a
# fix anomaly with superscripts
pass2 @45-0-5 @45
pass2 @45-5 @45
# Fix single letter and digit with overbar
pass2 @5$l[@126-12456] @156
pass2 @5-6$l[@126-12456] @156
pass2 [@5]!$s@156 @a
pass2 @46-a @456-256
# get rid of space for overscripts 
pass2 @126-a @126
pass2 @146-a @146
pass2 @0-146 @146
pass2 @a-146 @146
pass2 @a-12456 @12456
# fix complex fraction begin and end (not perfectly)
pass2 @1456-1456 @6-1456-1456
pass2 @3456-3456 @3456-6-3456
# Fix lim with overbar sign
pass2 @5-123-24-134-126-12456 @126-123-24-134
# Get rid of open paren before matrices
pass2 @12356-4-6-12356 @4-6-12356
pass2 @1256-4-6-12356 @4-6-12356
# take off baseline ind. comma space
pass2 [@5-6]!$l @6
pass2 @1b-12[]$d @3456 number sign before digit at beginning