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-rw-r--r--algebra.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/algebra.cpp b/algebra.cpp
index d46543db..9e5222d9 100644
--- a/algebra.cpp
+++ b/algebra.cpp
@@ -7,6 +7,7 @@
#include "algebra.h"
#include "integer.h"
+#include "trap.h"
#include <vector>