From 35f305eac46b24c3b982d7ae993b7013c09ff037 Mon Sep 17 00:00:00 2001
From: Richard Berger <richard.berger@temple.edu>
Date: Thu, 14 Nov 2019 17:02:23 -0500
Subject: [PATCH] Update docs: angle_cross

---
 doc/src/Eqs/angle_cross.jpg | Bin 7977 -> 0 bytes
 doc/src/Eqs/angle_cross.tex |   9 ------
 doc/src/angle_cross.rst     |  46 +++++++++++---------------
 doc/txt/angle_cross.txt     |  62 ------------------------------------
 4 files changed, 19 insertions(+), 98 deletions(-)
 delete mode 100644 doc/src/Eqs/angle_cross.jpg
 delete mode 100644 doc/src/Eqs/angle_cross.tex
 delete mode 100644 doc/txt/angle_cross.txt

diff --git a/doc/src/Eqs/angle_cross.jpg b/doc/src/Eqs/angle_cross.jpg
deleted file mode 100644
index b0f3fcf83ac2621807c7ae58772bfbddd1d94824..0000000000000000000000000000000000000000
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diff --git a/doc/src/Eqs/angle_cross.tex b/doc/src/Eqs/angle_cross.tex
deleted file mode 100644
index 9d1fdcb7f8..0000000000
--- a/doc/src/Eqs/angle_cross.tex
+++ /dev/null
@@ -1,9 +0,0 @@
-\documentclass[12pt]{article}
-
-\begin{document}
-\thispagestyle{empty}
-$$
-  E = K_{SS} \left(r_{12}-r_{12,0}\right)\left(r_{32}-r_{32,0}\right) + K_{BS0}\left(r_{12}-r_{12,0}\right)\left(\theta-\theta_0\right) + K_{BS1}\left(r_{32}-r_{32,0}\right)\left(\theta-\theta_0\right)
-$$
-
-\end{document}
diff --git a/doc/src/angle_cross.rst b/doc/src/angle_cross.rst
index 6c79776493..7dcff0264f 100644
--- a/doc/src/angle_cross.rst
+++ b/doc/src/angle_cross.rst
@@ -1,13 +1,13 @@
-.. index:: angle\_style cross
+.. index:: angle_style cross
 
-angle\_style cross command
+angle_style cross command
 ==========================
 
 Syntax
 """"""
 
 
-.. parsed-literal::
+.. code-block:: LAMMPS
 
    angle_style cross
 
@@ -15,7 +15,7 @@ Examples
 """"""""
 
 
-.. parsed-literal::
+.. code-block:: LAMMPS
 
    angle_style cross
    angle_coeff 1 200.0 100.0 100.0 1.25 1.25 107.0
@@ -26,13 +26,14 @@ Description
 The *cross* angle style uses a potential that couples the bond stretches of
 a bend with the angle stretch of that bend:
 
-.. image:: Eqs/angle_cross.jpg
-   :align: center
+.. math::
 
-where r12,0 is the rest value of the bond length between atom 1 and 2,
-r32,0 is the rest value of the bond length between atom 2 and 2,
-and theta0 is the rest value of the angle. KSS is the force constant of
-the bond stretch-bond stretch term and KBS0 and KBS1 are the force constants
+   E = K_{SS} \left(r_{12}-r_{12,0}\right)\left(r_{32}-r_{32,0}\right) + K_{BS0}\left(r_{12}-r_{12,0}\right)\left(\theta-\theta_0\right) + K_{BS1}\left(r_{32}-r_{32,0}\right)\left(\theta-\theta_0\right)
+
+where :math:`r_{12,0}` is the rest value of the bond length between atom 1 and 2,
+:math:`r_{32,0}` is the rest value of the bond length between atom 3 and 2,
+and :math:`\theta_0` is the rest value of the angle. :math:`K_{SS}` is the force constant of
+the bond stretch-bond stretch term and :math:`K_{BS0}` and :math:`K_{BS1}` are the force constants
 of the bond stretch-angle stretch terms.
 
 The following coefficients must be defined for each angle type via the
@@ -40,15 +41,15 @@ The following coefficients must be defined for each angle type via the
 the data file or restart files read by the :doc:`read\_data <read_data>`
 or :doc:`read\_restart <read_restart>` commands:
 
-* KSS (energy/distance\^2)
-* KBS0 (energy/distance/rad)
-* KBS1 (energy/distance/rad)
-* r12,0 (distance)
-* r32,0 (distance)
-* theta0 (degrees)
+* :math:`K_{SS}` (energy/distance\^2)
+* :math:`K_{BS0}` (energy/distance/rad)
+* :math:`K_{BS1}` (energy/distance/rad)
+* :math:`r_{12,0}` (distance)
+* :math:`r_{32,0}` (distance)
+* :math:`\theta_0` (degrees)
 
-Theta0 is specified in degrees, but LAMMPS converts it to radians
-internally; hence the units of KBS0 and KBS1 are in energy/distance/radian.
+:math:`\theta_0` is specified in degrees, but LAMMPS converts it to radians
+internally; hence the units of :math:`K_{BS0}` and :math:`K_{BS1}` are in energy/distance/radian.
 
 Restrictions
 """"""""""""
@@ -64,12 +65,3 @@ Related commands
 :doc:`angle\_coeff <angle_coeff>`
 
 **Default:** none
-
-
-----------
-
-
-
-.. _lws: http://lammps.sandia.gov
-.. _ld: Manual.html
-.. _lc: Commands_all.html
diff --git a/doc/txt/angle_cross.txt b/doc/txt/angle_cross.txt
deleted file mode 100644
index d9d83ed4b6..0000000000
--- a/doc/txt/angle_cross.txt
+++ /dev/null
@@ -1,62 +0,0 @@
-"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
-
-:link(lws,http://lammps.sandia.gov)
-:link(ld,Manual.html)
-:link(lc,Commands_all.html)
-
-:line
-
-angle_style cross command :h3
-
-[Syntax:]
-
-angle_style cross :pre
-
-[Examples:]
-
-angle_style cross
-angle_coeff 1 200.0 100.0 100.0 1.25 1.25 107.0 :pre
-
-[Description:]
-
-The {cross} angle style uses a potential that couples the bond stretches of
-a bend with the angle stretch of that bend:
-
-:c,image(Eqs/angle_cross.jpg)
-
-where r12,0 is the rest value of the bond length between atom 1 and 2,
-r32,0 is the rest value of the bond length between atom 2 and 2,
-and theta0 is the rest value of the angle. KSS is the force constant of
-the bond stretch-bond stretch term and KBS0 and KBS1 are the force constants
-of the bond stretch-angle stretch terms.
-
-The following coefficients must be defined for each angle type via the
-"angle_coeff"_angle_coeff.html command as in the example above, or in
-the data file or restart files read by the "read_data"_read_data.html
-or "read_restart"_read_restart.html commands:
-
-KSS (energy/distance^2)
-KBS0 (energy/distance/rad)
-KBS1 (energy/distance/rad)
-r12,0 (distance)
-r32,0 (distance)
-theta0 (degrees) :ul
-
-Theta0 is specified in degrees, but LAMMPS converts it to radians
-internally; hence the units of KBS0 and KBS1 are in energy/distance/radian.
-
-[Restrictions:]
-
-This angle style can only be used if LAMMPS was built with the
-USER_YAFF package.  See the "Build package"_Build_package.html doc
-page for more info.
-
-[Related commands:]
-
-"angle_coeff"_angle_coeff.html
-
-[Default:] none
-
-:line
-
-