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diff --git a/src/expansions.h b/src/expansions.h
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+/*
+Copyright 2015 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+Compute exp(V) and log(1+W)
+*/
+
+#ifndef EXPANSIONS_H
+#define EXPANSIONS_H
+
+#include "polynomial.h"
+#include "fields.h"
+
+// exp(V)
+int expand_exponential(Polynomial input_polynomial,Polynomial* output, Fields_Table fields);
+
+// log(1+W)
+int expand_logarithm(Polynomial input_polynomial, Polynomial* output, Fields_Table fields);
+
+
+#endif