#\DeclareLyXModule{AMS Theorems (Numbered by Type within Chapters)}
#\DeclareCategory{Maths}
#DescriptionBegin
#Defines theorem environments and the proof environment using the extended
#AMS machinery. Both numbered and unnumbered types are provided. Contrary to the
#plain AMS Theorem module, the different theorem types provided here each have
#a separate counter (e.g., theorem 1.1, theorem 1.2, lemma 1.1, proposition 1.1,
#theorem 1.3, lemma 1.2, ..., as opposed to theorem 1, theorem 2, lemma 3,
#proposition 4, ...). The numbering restarts for each chapter: theorem 1.1,
#theorem 2.1, ...
#DescriptionEnd
#Requires: theorems-ams-bytype
#Excludes: theorems-ams-extended-bytype

# Original 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 Kimberly Heck <rikiheck@lyx.org>
# Hacked June '09 by Paul Rubin <rubin@msu.edu> to use separate counters
# Chapter dependence added Oct '16 by Andrew Parsloe <aparsloe@clear.net.nz>
# Edited sep '22 by Udi Fogiel <udifoglle@gmail.com>

Format 99

Requires	amsmath,amsthm

Style Theorem
	Preamble
		\newcommand\lyx@newtheorem{\@ifstar{\newtheorem*}{\lyx@reg@newtheorem}}
		\theoremstyle{plain}
		\ifcsname c@chapter\endcsname
			\ifx\c@chapter\relax
				\newcommand\lyx@reg@newtheorem[2]{\newtheorem{#1}{#2}}
				\newtheorem{thm}{\protect\theoremname}
			\else
				\newcommand\lyx@reg@newtheorem[2]{\newtheorem{#1}{#2}[chapter]}
				\newtheorem{thm}{\protect\theoremname}[chapter]
			\fi
		\else
			\newcommand\lyx@reg@newtheorem[2]{\newtheorem{#1}{#2}}
			\newtheorem{thm}{\protect\theoremname}
		\fi
	EndPreamble
End