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diff --git a/pygments/lexers/algebra.py b/pygments/lexers/algebra.py
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--- a/pygments/lexers/algebra.py
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-# -*- coding: utf-8 -*-
-"""
-    pygments.lexers.algebra
-    ~~~~~~~~~~~~~~~~~~~~~~~
-
-    Lexers for computer algebra systems.
-
-    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-import re
-
-from pygments.lexer import RegexLexer, bygroups, words
-from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
-    Number, Punctuation
-
-__all__ = ['GAPLexer', 'MathematicaLexer', 'MuPADLexer', 'BCLexer']
-
-
-class GAPLexer(RegexLexer):
-    """
-    For `GAP <http://www.gap-system.org>`_ source code.
-
-    .. versionadded:: 2.0
-    """
-    name = 'GAP'
-    aliases = ['gap']
-    filenames = ['*.g', '*.gd', '*.gi', '*.gap']
-
-    tokens = {
-        'root': [
-            (r'#.*$', Comment.Single),
-            (r'"(?:[^"\\]|\\.)*"', String),
-            (r'\(|\)|\[|\]|\{|\}', Punctuation),
-            (r'''(?x)\b(?:
-                if|then|elif|else|fi|
-                for|while|do|od|
-                repeat|until|
-                break|continue|
-                function|local|return|end|
-                rec|
-                quit|QUIT|
-                IsBound|Unbind|
-                TryNextMethod|
-                Info|Assert
-              )\b''', Keyword),
-            (r'''(?x)\b(?:
-                true|false|fail|infinity
-              )\b''',
-             Name.Constant),
-            (r'''(?x)\b(?:
-                (Declare|Install)([A-Z][A-Za-z]+)|
-                   BindGlobal|BIND_GLOBAL
-              )\b''',
-             Name.Builtin),
-            (r'\.|,|:=|;|=|\+|-|\*|/|\^|>|<', Operator),
-            (r'''(?x)\b(?:
-                and|or|not|mod|in
-              )\b''',
-             Operator.Word),
-            (r'''(?x)
-              (?:\w+|`[^`]*`)
-              (?:::\w+|`[^`]*`)*''', Name.Variable),
-            (r'[0-9]+(?:\.[0-9]*)?(?:e[0-9]+)?', Number),
-            (r'\.[0-9]+(?:e[0-9]+)?', Number),
-            (r'.', Text)
-        ],
-    }
-
-
-class MathematicaLexer(RegexLexer):
-    """
-    Lexer for `Mathematica <http://www.wolfram.com/mathematica/>`_ source code.
-
-    .. versionadded:: 2.0
-    """
-    name = 'Mathematica'
-    aliases = ['mathematica', 'mma', 'nb']
-    filenames = ['*.nb', '*.cdf', '*.nbp', '*.ma']
-    mimetypes = ['application/mathematica',
-                 'application/vnd.wolfram.mathematica',
-                 'application/vnd.wolfram.mathematica.package',
-                 'application/vnd.wolfram.cdf']
-
-    # http://reference.wolfram.com/mathematica/guide/Syntax.html
-    operators = (
-        ";;", "=", "=.", "!=" "==", ":=", "->", ":>", "/.", "+", "-", "*", "/",
-        "^", "&&", "||", "!", "<>", "|", "/;", "?", "@", "//", "/@", "@@",
-        "@@@", "~~", "===", "&", "<", ">", "<=", ">=",
-    )
-
-    punctuation = (",", ";", "(", ")", "[", "]", "{", "}")
-
-    def _multi_escape(entries):
-        return '(%s)' % ('|'.join(re.escape(entry) for entry in entries))
-
-    tokens = {
-        'root': [
-            (r'(?s)\(\*.*?\*\)', Comment),
-
-            (r'([a-zA-Z]+[A-Za-z0-9]*`)', Name.Namespace),
-            (r'([A-Za-z0-9]*_+[A-Za-z0-9]*)', Name.Variable),
-            (r'#\d*', Name.Variable),
-            (r'([a-zA-Z]+[a-zA-Z0-9]*)', Name),
-
-            (r'-?\d+\.\d*', Number.Float),
-            (r'-?\d*\.\d+', Number.Float),
-            (r'-?\d+', Number.Integer),
-
-            (words(operators), Operator),
-            (words(punctuation), Punctuation),
-            (r'".*?"', String),
-            (r'\s+', Text.Whitespace),
-        ],
-    }
-
-
-class MuPADLexer(RegexLexer):
-    """
-    A `MuPAD <http://www.mupad.com>`_ lexer.
-    Contributed by Christopher Creutzig <christopher@creutzig.de>.
-
-    .. versionadded:: 0.8
-    """
-    name = 'MuPAD'
-    aliases = ['mupad']
-    filenames = ['*.mu']
-
-    tokens = {
-        'root': [
-            (r'//.*?$', Comment.Single),
-            (r'/\*', Comment.Multiline, 'comment'),
-            (r'"(?:[^"\\]|\\.)*"', String),
-            (r'\(|\)|\[|\]|\{|\}', Punctuation),
-            (r'''(?x)\b(?:
-                next|break|end|
-                axiom|end_axiom|category|end_category|domain|end_domain|inherits|
-                if|%if|then|elif|else|end_if|
-                case|of|do|otherwise|end_case|
-                while|end_while|
-                repeat|until|end_repeat|
-                for|from|to|downto|step|end_for|
-                proc|local|option|save|begin|end_proc|
-                delete|frame
-              )\b''', Keyword),
-            (r'''(?x)\b(?:
-                DOM_ARRAY|DOM_BOOL|DOM_COMPLEX|DOM_DOMAIN|DOM_EXEC|DOM_EXPR|
-                DOM_FAIL|DOM_FLOAT|DOM_FRAME|DOM_FUNC_ENV|DOM_HFARRAY|DOM_IDENT|
-                DOM_INT|DOM_INTERVAL|DOM_LIST|DOM_NIL|DOM_NULL|DOM_POLY|DOM_PROC|
-                DOM_PROC_ENV|DOM_RAT|DOM_SET|DOM_STRING|DOM_TABLE|DOM_VAR
-              )\b''', Name.Class),
-            (r'''(?x)\b(?:
-                PI|EULER|E|CATALAN|
-                NIL|FAIL|undefined|infinity|
-                TRUE|FALSE|UNKNOWN
-              )\b''',
-             Name.Constant),
-            (r'\b(?:dom|procname)\b', Name.Builtin.Pseudo),
-            (r'\.|,|:|;|=|\+|-|\*|/|\^|@|>|<|\$|\||!|\'|%|~=', Operator),
-            (r'''(?x)\b(?:
-                and|or|not|xor|
-                assuming|
-                div|mod|
-                union|minus|intersect|in|subset
-              )\b''',
-             Operator.Word),
-            (r'\b(?:I|RDN_INF|RD_NINF|RD_NAN)\b', Number),
-            # (r'\b(?:adt|linalg|newDomain|hold)\b', Name.Builtin),
-            (r'''(?x)
-              ((?:[a-zA-Z_#][\w#]*|`[^`]*`)
-              (?:::[a-zA-Z_#][\w#]*|`[^`]*`)*)(\s*)([(])''',
-             bygroups(Name.Function, Text, Punctuation)),
-            (r'''(?x)
-              (?:[a-zA-Z_#][\w#]*|`[^`]*`)
-              (?:::[a-zA-Z_#][\w#]*|`[^`]*`)*''', Name.Variable),
-            (r'[0-9]+(?:\.[0-9]*)?(?:e[0-9]+)?', Number),
-            (r'\.[0-9]+(?:e[0-9]+)?', Number),
-            (r'.', Text)
-        ],
-        'comment': [
-            (r'[^*/]', Comment.Multiline),
-            (r'/\*', Comment.Multiline, '#push'),
-            (r'\*/', Comment.Multiline, '#pop'),
-            (r'[*/]', Comment.Multiline)
-        ],
-    }
-
-
-class BCLexer(RegexLexer):
-    """
-    A `BC <https://www.gnu.org/software/bc/>`_ lexer.
-
-    .. versionadded:: 2.1
-    """
-    name = 'BC'
-    aliases = ['bc']
-    filenames = ['*.bc']
-
-    tokens = {
-        'root': [
-            (r'/\*', Comment.Multiline, 'comment'),
-            (r'"(?:[^"\\]|\\.)*"', String),
-            (r'[{}();,]', Punctuation),
-            (words(('if', 'else', 'while', 'for', 'break', 'continue',
-                    'halt', 'return', 'define', 'auto', 'print', 'read',
-                    'length', 'scale', 'sqrt', 'limits', 'quit',
-                    'warranty'), suffix=r'\b'), Keyword),
-            (r'\+\+|--|\|\||&&|'
-             r'([-<>+*%\^/!=])=?', Operator),
-            # bc doesn't support exponential
-            (r'[0-9]+(\.[0-9]*)?', Number),
-            (r'\.[0-9]+', Number),
-            (r'.', Text)
-        ],
-        'comment': [
-            (r'[^*/]+', Comment.Multiline),
-            (r'\*/', Comment.Multiline, '#pop'),
-            (r'[*/]', Comment.Multiline)
-        ],
-    }