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diff --git a/fuzzylite/src/norm/s/EinsteinSum.cpp b/fuzzylite/src/norm/s/EinsteinSum.cpp
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+++ b/fuzzylite/src/norm/s/EinsteinSum.cpp
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+/*
+ Author: Juan Rada-Vilela, Ph.D.
+ Copyright (C) 2010-2014 FuzzyLite Limited
+ All rights reserved
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ fuzzylite is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with fuzzylite.  If not, see <http://www.gnu.org/licenses/>.
+
+ fuzzylite™ is a trademark of FuzzyLite Limited.
+
+ */
+
+#include "fl/norm/s/EinsteinSum.h"
+
+namespace fl {
+
+    std::string EinsteinSum::className() const {
+        return "EinsteinSum";
+    }
+
+    scalar EinsteinSum::compute(scalar a, scalar b) const {
+        return (a + b) / (1.0 + a * b);
+    }
+
+    EinsteinSum* EinsteinSum::clone() const {
+        return new EinsteinSum(*this);
+    }
+
+    SNorm* EinsteinSum::constructor() {
+        return new EinsteinSum;
+    }
+
+}