This file is indexed.

/usr/share/lyx/layouts/amsart.layout is in lyx-common 2.2.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#% Do not delete the line below; configure depends on this
#  \DeclareLaTeXClass{American Mathematical Society (AMS) Article}
#  \DeclareCategory{Articles}
# AMS-Article textclass definition file. Taken from initial LyX source code
# and from the Article textclass definition file, following the AMS sample
# paper "testmath.tex" of January, 1995
# Author : David L. Johnson <dlj0@lehigh.edu>
# Probably broken by Jean-Marc Lasgouttes <Jean-Marc.Lasgouttes@inria.fr>
# modified and modularized by Emmanuel GUREGHIAN <gureghia@boston.bertin.fr>
# Tinkered with Sep. '07 by Paul Rubin <rubin@msu.edu>
# Modularized Jan '08 by Richard Heck <rgheck@brown.edu>
# Moved "number within sections" to modules Aug '09 (Paul Rubin <rubin@msu.edu>)

Format 60

Columns                 1
Sides                   2
PageStyle               Headers

Provides amsmath         1
Provides makeidx         1

ClassOptions
	FontSize   8|9|10|11|12
End

DefaultModule theorems-ams
DefaultModule eqs-within-sections
DefaultModule figs-within-sections

Style Standard
	Category      MainText
	Margin        Static
	LatexType     Paragraph
	LatexName     dummy
	ParIndent     MM
	ParSkip       0.4
	Align         Block
	AlignPossible Block, Left, Right, Center
	LabelType     No_Label
End

Input stdfloats.inc
Input stdcounters.inc
Input stdinsets.inc
Input stdsections.inc
Input stdstarsections.inc
Input lyxmacros.inc
Input stdlayouts.inc
Input stdlists.inc
Input amsdefs.inc

NoStyle         Chapter
NoCounter       chapter
NoStyle         Paragraph
NoCounter       paragraph
NoStyle         Subparagraph
NoCounter       subparagraph
NoStyle         Chapter*
NoStyle Verse    # Although mathematicians tend to be poets at times,
                 # we don't need this.


Style Section
	Align        Center
	Font
	  Series     Medium
	  Shape      Smallcaps
	  Size       Normal
	EndFont
	TocLevel 1
End


Style Section*
	Align        Center
	Font
	  Series     Medium
	  Shape      Smallcaps
	  Size       Large
	EndFont
End


Style SpecialSection
	CopyStyle   Section
	LatexName   specialsection
	Font
	  Shape      Up
	EndFont
End


Style SpecialSection*
	CopyStyle    SpecialSection
	Category     Unnumbered
	LatexName    specialsection*
	Margin       Static
	LabelType    No_Label
	LabelCounter ""
	ResetArgs    1
End


Style Subsection
	Font
	  Series     Bold
	  Size       Normal
	EndFont
	LabelFont
	  Series     Medium
	EndFont
	TocLevel 2
End


Style Subsection*
	Font
	  Series     Bold
	  Size       Normal
	EndFont
	LabelFont
	  Series     Medium
	EndFont
End


Style Subsubsection
	Font
	  Shape      Italic
	  Series     Medium
	  Size       Normal
	EndFont
	TocLevel 3
End


Style Subsubsection*
	Font
	  Shape      Italic
	  Series     Medium
	  Size       Normal
	EndFont
End