From 4c55a37b4fe3a6b811c88aa697d55e17255ce659 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Fri, 25 Sep 2009 06:43:55 -0400
Subject: [PATCH] Added cased equation to piston tension model description

---
 src/sawsim.nw | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/sawsim.nw b/src/sawsim.nw
index 5a62b96..f6d9a0d 100644
--- a/src/sawsim.nw
+++ b/src/sawsim.nw
@@ -4476,6 +4476,12 @@ than a particular threshold $L$, and infinite tension for $x>L$.  The
 tension at $x=L$ is undefined, but may be any positive value.  The
 model is called the ``piston'' model because it resembles a
 frictionless piston sliding in a rigid cylinder of length $L$.
+$$
+  F = \begin{cases}
+        0 & \text{if $x<L$}, \\
+        \infty & \text{if $x>L$}.
+      \end{cases}
+$$
 
 Note that because of it's infinte stiffness at $x=L$, fully extended
 domains with this tension model will be identical to completely rigid
-- 
2.26.2