为什么我的数组第一行之前有这么多空间？我该如何修复它（因为我不相信这是它的默认行为）？
\documentclass[12pt]{article}
\usepackage{parskip}
\setlength{\parindent}{0cm}
\usepackage{fontspec}
\usepackage[english,greek]{babel}
\usepackage[fleqn]{amsmath}
\usepackage{unicode-math}
\setmainfont
[
Ligatures=TeX,
Extension=.otf,
UprightFont=*,
BoldFont=*Bold,
ItalicFont=*It,
BoldItalicFont=*BoldIt,
Mapping=tex-text
]{GFSArtemisia}
\setsansfont[Mapping=tex-text]{GFSArtemisia.otf}
\setmathfont{latinmodern-math.otf}
\setmathfont[range=\varnothing]{Asana-Math.otf}
\setmathfont[range=\int]{latinmodern-math.otf}
\begin{document}
\begin{equation}
\left[\begin{array}{c c c}
g_{11} & g_{12} & g_{13}\\
g_{21} & g_{22} & g_{23}\\
g_{21} & g_{32} & g_{33}
\end{array}\right]
\end{equation}
\end{document}
文件列表（不是来自 MWE，而是来自我的正常序言）
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size12.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
geometry.sty 2010/09/12 v5.6 Page Geometry
keyval.sty 1999/03/16 v1.13 key=value parser (DPC)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
ifvtex.sty 2010/03/01 v1.5 Detect VTeX and its facilities (HO)
ifxetex.sty 2010/09/12 v0.6 Provides ifxetex conditional
parskip.sty 2001/04/09 non-zero parskip adjustments
amsmath.sty 2013/01/14 v2.14 AMS math features
amstext.sty 2000/06/29 v2.01
amsgen.sty 1999/11/30 v2.0
amsbsy.sty 1999/11/29 v1.2d
amsopn.sty 1999/12/14 v2.01 operator names
unicode-math.sty 2013/05/04 v0.7e Unicode maths in XeLaTeX and LuaLaTeX
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
expl3.sty 2014/01/07 v4646 L3 Experimental code bundle wrapper
l3names.sty 2014/01/04 v4640 L3 Namespace for primitives
l3bootstrap.sty 2014/01/04 v4640 L3 Experimental bootstrap code
etex.sty 1998/03/26 v2.0 eTeX basic definition package (PEB)
l3basics.sty 2014/01/04 v4642 L3 Basic definitions
l3expan.sty 2014/01/04 v4642 L3 Argument expansion
l3tl.sty 2013/12/27 v4625 L3 Token lists
l3seq.sty 2013/12/14 v4623 L3 Sequences and stacks
l3int.sty 2013/08/02 v4583 L3 Integers
l3quark.sty 2013/12/14 v4623 L3 Quarks
l3prg.sty 2014/01/04 v4642 L3 Control structures
l3clist.sty 2013/07/28 v4581 L3 Comma separated lists
l3token.sty 2013/08/25 v4587 L3 Experimental token manipulation
l3prop.sty 2013/12/14 v4623 L3 Property lists
l3msg.sty 2013/07/28 v4581 L3 Messages
l3file.sty 2013/10/13 v4596 L3 File and I/O operations
l3skip.sty 2013/07/28 v4581 L3 Dimensions and skips
l3keys.sty 2013/12/08 v4614 L3 Experimental key-value interfaces
l3fp.sty 2014/01/04 v4642 L3 Floating points
l3box.sty 2013/07/28 v4581 L3 Experimental boxes
l3coffins.sty 2013/12/14 v4624 L3 Coffin code layer
l3color.sty 2012/08/29 v4156 L3 Experimental color support
l3luatex.sty 2013/07/28 v4581 L3 Experimental LuaTeX-specific functions
l3candidates.sty 2014/01/06 v4643 L3 Experimental additions to l3kernel
xparse.sty 2013/12/31 v4634 L3 Experimental document command parser
l3keys2e.sty 2013/12/31 v4634 LaTeX2e option processing using LaTeX3 keys
fontspec.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
fontspec-patches.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
fixltx2e.sty 2006/09/13 v1.1m fixes to LaTeX
fontspec-xetex.sty 2013/05/20 v2.3c Font selection for XeLaTeX and LuaLaTeX
fontenc.sty
eu1enc.def 2010/05/27 v0.1h Experimental Unicode font encodings
eu1lmr.fd 2009/10/30 v1.6 Font defs for Latin Modern
xunicode.sty 2011/09/09 v0.981 provides access to latin accents and many
other characters in Unicode lower plane
eu1lmss.fd 2009/10/30 v1.6 Font defs for Latin Modern
graphicx.sty 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2010/04/23 v1.9 graphics configuration of TeX Live
xetex.def 2013/04/29 v0.96 LaTeX color/graphics driver for XeTeX (RRM/JK)
fontspec.cfg
catchfile.sty 2011/03/01 v1.6 Catch the contents of a file (HO)
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
etexcmds.sty 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
fix-cm.sty 2006/09/13 v1.1m fixes to LaTeX
ts1enc.def 2001/06/05 v3.0e (jk/car/fm) Standard LaTeX file
filehook.sty 2011/10/12 v0.5d Hooks for input files
unicode-math-xetex.sty
unicode-math-table.tex
babel.sty 2013/12/03 3.9h The Babel package
english.ldf 2012/08/20 v3.3p English support from the babel system
greek.ldf 2013/12/03 v1.8a Greek support for the babel system
greek-euenc.def 2013/12/02 0.11.1 Greek LICRs for XeTeX and LuaTeX
greek-fontenc.def 2013/11/28 v0.11 Common Greek font encoding definitions
xgreek-fixes.def
listings.sty 2013/08/26 1.5b (Carsten Heinz)
lstmisc.sty 2013/08/26 1.5b (Carsten Heinz)
listings.cfg 2013/08/26 1.5b listings configuration
multicol.sty 2011/06/27 v1.7a multicolumn formatting (FMi)
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg 2007/01/18 v1.5 color configuration of teTeX/TeXLive
colortbl.sty 2012/02/13 v1.0a Color table columns (DPC)
array.sty 2008/09/09 v2.4c Tabular extension package (FMi)
dvipsnam.def 1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
svgnam.def 2007/01/21 v2.11 Predefined colors according to SVG 1.1 (UK)
longtable.sty 2004/02/01 v4.11 Multi-page Table package (DPC)
tikz.sty 2010/10/13 v2.10 (rcs-revision 1.76)
pgf.sty 2008/01/15 v2.10 (rcs-revision 1.12)
pgfrcs.sty 2010/10/25 v2.10 (rcs-revision 1.24)
everyshi.sty 2001/05/15 v3.00 EveryShipout Package (MS)
pgfrcs.code.tex
pgfcore.sty 2010/04/11 v2.10 (rcs-revision 1.7)
pgfsys.sty 2010/06/30 v2.10 (rcs-revision 1.37)
pgfsys.code.tex
pgfsyssoftpath.code.tex 2008/07/18 (rcs-revision 1.7)
pgfsysprotocol.code.tex 2006/10/16 (rcs-revision 1.4)
pgfcore.code.tex
pgfcomp-version-0-65.sty 2007/07/03 v2.10 (rcs-revision 1.7)
pgfcomp-version-1-18.sty 2007/07/23 v2.10 (rcs-revision 1.1)
pgffor.sty 2010/03/23 v2.10 (rcs-revision 1.18)
pgfkeys.sty
pgfkeys.code.tex
pgffor.code.tex
tikz.code.tex
t3cmr.fd 2001/12/31 TIPA font definitions
答案1
仅当
\usepackage{setspace}
\doublespacing
被添加。
同时添加
\renewcommand{\arraystretch}{0.6}