From 68886709d6731cf456ce5e335f85b06f59ae983e Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Mon, 2 Apr 2012 07:42:09 -0400
Subject: [PATCH] mathjax wins

---
 math-replay/.gitignore                        |  1 +
 math-replay/Makefile                          |  8 ++
 .../algebra/solving-for-a-variable.haml       | 88 +++++++++++++++++++
 math-replay/mathjax-demo.haml                 |  9 ++
 4 files changed, 106 insertions(+)
 create mode 100644 math-replay/Makefile
 create mode 100644 math-replay/algebra/solving-for-a-variable.haml
 create mode 100644 math-replay/mathjax-demo.haml

diff --git a/math-replay/.gitignore b/math-replay/.gitignore
index 3eec47d..d9766f8 100644
--- a/math-replay/.gitignore
+++ b/math-replay/.gitignore
@@ -1,3 +1,4 @@
 *.aux
 *.log
 *.pdf
+*.html
diff --git a/math-replay/Makefile b/math-replay/Makefile
new file mode 100644
index 0000000..14407cb
--- /dev/null
+++ b/math-replay/Makefile
@@ -0,0 +1,8 @@
+ALL := $(patsubst %.haml,%.html,$(shell find . -name '*.haml'))
+
+
+%.html:%.haml
+	haml $^ $@
+
+
+all: $(ALL)
diff --git a/math-replay/algebra/solving-for-a-variable.haml b/math-replay/algebra/solving-for-a-variable.haml
new file mode 100644
index 0000000..3562e03
--- /dev/null
+++ b/math-replay/algebra/solving-for-a-variable.haml
@@ -0,0 +1,88 @@
+%html
+  %head
+    %script{:type => "text/x-mathjax-config"}
+      MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
+    %script{:type => "text/javascript", :src => "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"}
+    :css
+      .solution {
+        border-top: 1px dotted #222;
+      }
+  %body
+    %h2 Solve for $l$:
+    #solve-for-l-01.solution
+      :escaped
+        $$
+        \begin{eqnarray}
+        -2lmn + 8m - 3n + 9 & = & -5m + 3n - 7 \\
+        -2lmn + 8m - 3n + 9 - 9 & = & -5m + 3n - 7 - 9 \\
+        -2lmn + 8m - 3n & = & -5m + 3n - 16 \\
+        -2lmn + 8m - 3n + 3n & = & -5m + 3n - 16 + 3n \\
+        -2lmn + 8m & = & -5m + 3n - 16 + 3n \\
+        -2lmn + 8m - 8m & = & -5m + 3n - 16 + 3n - 8m \\
+        -2lmn & = & -5m + 3n - 16 + 3n - 8m \\
+        \frac{-2lmn}{-2} & = & \frac{-5m + 3n - 16 + 3n - 8m}{-2} \\
+        lmn & = & \frac{-5m + 3n - 16 + 3n - 8m}{-2} \\
+        \frac{lmn}{mn} & = & \frac{\frac{-5m + 3n - 16 + 3n - 8m}{-2}}{mn} \\
+        l & = & \frac{\frac{-5m + 3n - 16 + 3n - 8m}{-2}}{mn} \\
+        l & = & \frac{\frac{-5m - 16 + 6n - 8m}{-2}}{mn} \\
+        l & = & \frac{\frac{-16 + 6n - 13m}{-2}}{mn} \\
+        l & = & \frac{8 - 3n - \frac{13m}{-2}}{mn} \\
+        \end{eqnarray}
+        $$
+
+    #solve-for-l-02.solution
+      :escaped
+        $$
+        \begin{eqnarray}
+        -2lmn + 8m - 3n + 9 & = & -5m + 3n - 7 \\
+        -2lmn + 8m - 3n + 9 - 9 & = & -5m + 3n - 7 - 9 \\
+        -2lmn + 8m - 3n & = & -5m + 3n + 2 \\
+        -2lmn + 8m - 3n + 3n & = & -5m + 3n + 2 + 3n \\
+        -2lmn + 8m & = & -5m + 6n + 2 \\
+        -2lmn + 8m - 8m & = & -5m + 6n + 2 - 8m \\
+        -2lmn & = & -13m + 6n + 2 \\
+        \frac{-2lmn}{-2} & = & \frac{-13m + 6n + 2}{-2} \\
+        lmn & = & \frac{-13m}{-2} + \frac{6n}{-2} + \frac{2}{-2} \\
+        lmn & = & \frac{-13m}{-2} + \frac{6n}{-2} - 1 \\
+        lmn & = & \frac{-13m}{-2} + \frac{3n}{-1} - 1 \\
+        lmn & = & \frac{-13m}{-2} - 3n - 1 \\
+        \frac{lmn}{mn} & = & \frac{\frac{-13m}{-2} - 3n - 1}{mn} \\
+        l & = & \frac{\frac{-13m}{-2} - 3n - 1}{mn} \\
+        \end{eqnarray}
+        $$
+
+    #solve-for-l-03.solution
+      :escaped
+        $$
+        \begin{eqnarray}
+        -2lmn + 8m - 3n + 9 & = & -5m + 3n - 7 \\
+        -9 + -2lmn + 8m - 3n + 9 & = & -9 + -5m + 3n - 7 \\
+        -2lmn + 8m - 3n & = & -9 + -5m + 3n - 7 \\
+        -2lmn + 8m - 3n & = & -5m + 3n - 7 - 9 \\
+        -2lmn + 8m - 3n & = & -5m + 3n + -7 + -9 \\
+        -2lmn + 8m - 3n & = & -5m + 3n + -16 \\
+        -2lmn + 8m - 3n + 3n & = & -5m + 3n + -16 + 3n \\
+        -2lmn + 8m & = & -5m + -16 + 6n \\
+        -2lmn + 8m - 8m & = & -5m + -16 + 6n - 8m \\
+        -2lmn & = & -13m + 6n + -16 \\
+        \frac{-2lmn}{-2mn} & = & \frac{-13m + 6n + -16}{-2mn} \\
+        l & = & \frac{-13m + 6n + -16}{-2mn} \\
+        l & = & \frac{13m - 6n + 16}{2mn} \\
+        \end{eqnarray}
+        $$
+
+    %h2 Solve for $x$:
+    #solve-for-x-01.solution
+      :escaped
+        $$
+        \begin{eqnarray}
+        -2xy + 5xz - 5x + 10 & = & -6y - 2 \\
+        -2xy + 5xz - 5x + 10 - 10 & = & -6y - 2 - 10 \\
+        -2xy + 5xz - 5x & = & -6y + -2 + -10 \\
+        -2xy + 5xz - 5x & = & -6y + -12 \\
+        -2xy + 5xz - 5xz - 5x & = & -6y - 12 - 5xz \\
+        -2xy - 5x & = & -6y - 12 - 5xz \\
+        -2xy + 2xy - 5x & = & -6y - 12 - 5xz + 2xy \\
+        -5x & = & -6y - 12 - 5xz + 2xy \\
+        \end{eqnarray}
+        $$
diff --git a/math-replay/mathjax-demo.haml b/math-replay/mathjax-demo.haml
new file mode 100644
index 0000000..6d546fe
--- /dev/null
+++ b/math-replay/mathjax-demo.haml
@@ -0,0 +1,9 @@
+%html
+  %head
+    %script{:type => "text/x-mathjax-config"}
+      MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
+    %script{:type => "text/javascript", :src => "http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"}
+  %body
+    %p
+      When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\)
+      and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$