This file is indexed.

/usr/share/lyx/layouts/amsbook.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) Book}
#  \DeclareCategory{Books}
# 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


Preamble
	\numberwithin{section}{chapter}
EndPreamble


Input stdsections.inc
Input stdinsets.inc
Input numreport.inc


Style Section
	Align          Center
	Font
	  Series       Bold
	  Size         Large
	EndFont
	TocLevel 1
End


Style Subsection
	Font
	  Series       Bold
	  Size         Normal
	EndFont
	TocLevel 2
End


Style Subsubsection
	Font
	  Shape        Italic
	  Size         Normal
	EndFont
	TocLevel 3
End

Input stdstarsections.inc

Style Section*
	Align          Center
	Font
	  Series       Bold
	  Size         Large
	EndFont
End


Style Subsection*
	Font
	  Series       Bold
	  Size         Normal
	EndFont
End


Style Subsubsection*
	Font
	  Shape        Italic
	  Size         Normal
	EndFont
End


Input lyxmacros.inc
Input stdlayouts.inc
Input stdlists.inc
Input stdfloats.inc
Input stdcounters.inc
Input amsdefs.inc

# Unwanted styles from the includes
NoStyle Verse

# Chapter is _not_ prepended
# JSpitz: this seems to be not true (anymore?)
#Style Section
#	LabelString          "\arabic{section}"
#	LabelStringAppendix  "\arabic{section}"
#End


Style Paragraph
	Font
	  Series       Medium
	EndFont
	TocLevel 4
End


# End-of Chapter exercises  I need a way to do this.
Style Chapter_Exercises
	Margin                First_Dynamic
	LatexType             Item_Environment
	LatexName             lyxxcb
	NextNoIndent          1
	LeftMargin            MMN
	LabelSep              xx
	ParSkip               0.0
	ItemSep               0.2
	TopSep                0.7
	BottomSep             0.7
	ParSep                0.3
	Align                 Block
	AlignPossible         Block, Left
	LabelType             Static
	LabelFont
	  Shape               Up
	  Series              Bold
	EndFont
	Preamble
	  \newenvironment{lyxxcb}{\begin{xcb}{Exercises}\begin{enumerate}}
	                     {\end{enumerate}\end{xcb}}
	EndPreamble
End