<s>
LyX	B-Language
(	O
styled	O
as	O
LYX	B-Language
;	O
pronounced	O
)	O
is	O
an	O
open	B-Application
source	I-Application
,	O
graphical	B-Application
user	I-Application
interface	I-Application
document	B-Application
processor	I-Application
based	O
on	O
the	O
LaTeX	B-Application
typesetting	I-Application
system	O
.	O
</s>
<s>
Unlike	O
most	O
word	B-General_Concept
processors	I-General_Concept
,	O
which	O
follow	O
the	O
WYSIWYG	B-Application
(	O
"	O
what	B-Application
you	I-Application
see	I-Application
is	I-Application
what	I-Application
you	I-Application
get	I-Application
"	O
)	O
paradigm	O
,	O
LyX	B-Language
has	O
a	O
WYSIWYM	B-General_Concept
(	O
"	O
what	O
you	O
see	O
is	O
what	O
you	O
mean	O
"	O
)	O
approach	O
,	O
where	O
what	O
shows	O
up	O
on	O
the	O
screen	O
roughly	O
depicts	O
the	O
semantic	O
structure	O
of	O
the	O
page	O
and	O
is	O
only	O
an	O
approximation	O
of	O
the	O
document	O
produced	O
by	O
TeX	B-Application
.	O
</s>
<s>
Since	O
LyX	B-Language
relies	O
on	O
the	O
typesetting	O
system	O
of	O
LaTeX	B-Application
without	O
being	O
a	O
full-fledged	O
LaTeX	B-Application
editor	O
itself	O
,	O
it	O
has	O
the	O
power	O
and	O
flexibility	O
of	O
LaTeX	B-Application
,	O
and	O
can	O
handle	O
documents	O
including	O
books	O
,	O
notes	O
,	O
theses	O
,	O
academic	O
papers	O
,	O
letters	O
,	O
etc	O
.	O
</s>
<s>
LyX	B-Language
's	O
interface	B-Application
is	O
structured	O
so	O
that	O
while	O
knowledge	O
of	O
the	O
LaTeX	B-Application
markup	O
language	O
is	O
not	O
necessary	O
for	O
basic	O
usage	O
,	O
new	O
LaTeX	B-Application
directives	O
can	O
be	O
added	O
into	O
the	O
document	O
to	O
support	O
more	O
complex	O
features	O
during	O
editing	O
—	O
though	O
not	O
at	O
the	O
level	O
of	O
full	O
control	O
a	O
full-fledged	O
LaTeX	B-Application
editor	O
can	O
provide	O
.	O
</s>
<s>
LyX	B-Language
is	O
popular	O
among	O
technical	O
authors	O
and	O
scientists	O
for	O
its	O
advanced	O
mathematical	O
modes	O
,	O
though	O
it	O
is	O
increasingly	O
used	O
by	O
non-mathematically-oriented	O
scholars	O
as	O
well	O
for	O
its	O
bibliographic	O
database	O
integration	O
and	O
its	O
ability	O
to	O
manage	O
multiple	O
files	O
.	O
</s>
<s>
LyX	B-Language
has	O
also	O
become	O
a	O
popular	O
publishing	O
tool	O
among	O
self-publishers	O
.	O
</s>
<s>
LyX	B-Language
is	O
available	O
for	O
all	O
major	O
operating	O
systems	O
,	O
including	O
Windows	B-Application
,	O
MacOS	B-Application
,	O
Linux	B-Application
,	O
UNIX	B-Application
,	O
ChromeOS	B-Operating_System
,	O
OS/2	B-Application
and	O
Haiku	B-Language
.	O
</s>
<s>
LyX	B-Language
can	O
be	O
redistributed	O
and	O
modified	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
and	O
is	O
thus	O
free	B-Application
software	I-Application
.	O
</s>
<s>
LyX	B-Language
is	O
a	O
fully	O
featured	O
document	B-Application
processor	I-Application
.	O
</s>
<s>
It	O
provides	O
structured	O
document	O
creation	O
and	O
editing	O
,	O
branches	O
for	O
having	O
different	O
versions	O
of	O
the	O
same	O
document	O
,	O
master	O
and	O
child	O
documents	O
,	O
change	O
tracking	O
,	O
support	O
for	O
writing	O
documents	O
in	O
many	O
languages	O
and	O
scripts	O
,	O
spell	B-Application
checking	I-Application
,	O
graphics	O
,	O
table	B-Application
editing	O
and	O
automatic	O
cross-reference	O
(	O
hyperlink	O
)	O
managing	O
.	O
</s>
<s>
LyX	B-Language
provides	O
automatically	O
numbered	O
headings	O
,	O
titles	O
,	O
and	O
paragraphs	O
,	O
with	O
document	O
outline	O
.	O
</s>
<s>
It	O
features	O
a	O
powerful	O
mathematical	O
formula	O
editor	O
with	O
point-and-click	O
or	O
keyboard-only	O
interface	B-Application
.	O
</s>
<s>
LyX	B-Language
has	O
native	O
support	O
for	O
many	O
document	O
classes	O
and	O
templates	O
available	O
in	O
LaTeX	B-Application
through	O
\documentclass{theclass}	O
.	O
</s>
<s>
User	O
layouts	O
and	O
modules	B-Architecture
can	O
be	O
made	O
for	O
those	O
missing	O
.	O
</s>
<s>
Text	O
is	O
laid	O
out	O
according	O
to	O
standard	O
typographic	B-Application
rules	O
,	O
including	O
ligatures	O
,	O
kerning	O
,	O
indents	O
,	O
spacing	O
,	O
and	O
hyphenation	B-Algorithm
.	O
</s>
<s>
It	O
provides	O
BibTeX/BibLaTeX	B-Language
citation	O
support	O
,	O
comprehensive	O
cross-referencing	O
and	O
PDF	O
hyperlinks	O
.	O
</s>
<s>
LyX	B-Language
can	O
import	O
various	O
common	O
text	O
formats	O
.	O
</s>
<s>
Documents	O
can	O
be	O
processed	O
in	O
LaTeX	B-Application
,	O
PdfLaTeX	B-Language
,	O
XeTeX	B-Application
and	O
LuaTeX	B-Language
typesetting	O
systems	O
or	O
exported	O
to	O
DocBook	B-Protocol
SGML	B-Language
,	O
XHTML	B-Language
and	O
plain	O
text	O
.	O
</s>
<s>
Versioning	O
is	O
provided	O
through	O
external	O
control	O
systems	O
like	O
SVN	B-Application
,	O
Git	O
,	O
RCS	O
,	O
and	O
CVS	O
.	O
</s>
<s>
LyX	B-Language
supports	O
right-to-left	O
languages	O
like	O
Arabic	O
,	O
Persian	O
,	O
and	O
Hebrew	O
,	O
along	O
with	O
support	O
for	O
bi-directional	O
text	O
.	O
</s>
<s>
Documents	O
can	O
embed	O
calculations	O
via	O
Octave	B-Language
or	O
Computer	O
Algebra	O
Systems	O
(	O
CAS	O
)	O
like	O
Maple	B-Language
,	O
Maxima	B-Language
and	O
Mathematica	B-Application
.	O
</s>
<s>
Matthias	O
Ettrich	O
started	O
developing	O
a	O
shareware	O
program	O
called	O
Lyrix	B-Language
in	O
1995	O
.	O
</s>
<s>
It	O
was	O
then	O
announced	O
on	O
Usenet	B-Application
,	O
where	O
it	O
received	O
a	O
great	O
deal	O
of	O
attention	O
in	O
the	O
following	O
years	O
.	O
</s>
<s>
Shortly	O
after	O
the	O
initial	O
release	O
,	O
Lyrix	B-Language
was	O
renamed	O
to	O
LyX	B-Language
due	O
to	O
a	O
name	O
clash	O
with	O
a	O
word	B-General_Concept
processor	I-General_Concept
produced	O
by	O
the	O
company	O
Santa	O
Cruz	O
Operation	O
.	O
</s>
<s>
The	O
name	O
LyX	B-Language
was	O
chosen	O
because	O
of	O
the	O
file	O
suffix	O
.lyx	B-Language
for	O
Lyrix	B-Language
files	O
.	O
</s>
<s>
LyX	B-Language
has	O
no	O
set	O
release	O
schedule	O
.	O
</s>
<s>
The	O
following	O
table	B-Application
lists	O
the	O
dates	O
of	O
all	O
major	O
releases	O
.	O
</s>
<s>
For	O
collaboration	O
between	O
different	O
users	O
using	O
the	O
same	O
major	O
release	O
is	O
recommended	O
as	O
LyX	B-Language
file	O
format	O
remains	O
fixed	O
within	O
each	O
major	O
release	O
(	O
e.g.	O
</s>
<s>
all	O
minor	O
LyX	B-Language
versions	O
2.3.0	O
,	O
2.3.1	O
,	O
2.3.2	O
,	O
...	O
use	O
strictly	O
the	O
same	O
file	O
format	O
)	O
.	O
</s>
