From 7b3c3d2b5c69dcfe839ee142be897a0ac997eec2 Mon Sep 17 00:00:00 2001
From: Christophe Geuzaine <cgeuzaine@uliege.be>
Date: Tue, 19 Feb 2019 10:30:50 +0100
Subject: [PATCH] Update microstrip.pro

---
 Electrostatics/microstrip.pro | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Electrostatics/microstrip.pro b/Electrostatics/microstrip.pro
index 444ea15..27fee82 100644
--- a/Electrostatics/microstrip.pro
+++ b/Electrostatics/microstrip.pro
@@ -190,7 +190,7 @@ Formulation {
      product over a domain D. If the test-functions v' are differentiable,
      integration by parts using Green's identity leads to finding v such that
 
-     (epsilon grad v, grad v')_Vol_Ele + (n . (epsilon grad v), v')_Bnd_Vol_Ele = 0
+     (epsilon grad v, grad v')_Vol_Ele - (n . (epsilon grad v), v')_Bnd_Vol_Ele = 0
 
      holds for all v', where Bnd_Vol_Ele is the boundary of Vol_Ele. In our
      microstrip example this surface term vanishes, as there is either no test
-- 
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