From: W. Trevor King <wking@drexel.edu>
Date: Fri, 25 Sep 2009 10:43:55 +0000 (-0400)
Subject: Added cased equation to piston tension model description
X-Git-Url: http://git.tremily.us/?p=sawsim.git;a=commitdiff_plain;h=4c55a37b4fe3a6b811c88aa697d55e17255ce659

Added cased equation to piston tension model description
---

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