diff --git a/include/etl/math_constants.h b/include/etl/math_constants.h
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+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2018 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+coPIes of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+coPIes or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#ifndef ETL_MATH_CONSTANTS_INCLUDED
+#define ETL_MATH_CONSTANTS_INCLUDED
+
+#include "platform.h"
+
+namespace etl
+{
+  namespace math
+  {
+    const double pi               = 3.14159265358979;
+    const double pi_reciprocal    = 0.31830988618379;
+    const double pi_squared       = 9.86960440108936;
+    const double e                = 2.71828182845905;
+    const double e_reciprocal     = 0.36787944117144;
+    const double e_squared        = 7.38905609893065;
+    const double root2            = 1.41421356237310;
+    const double root2_reciprocal = 0.70710678118655;
+    const double euler            = 0.57721566490153;
+    const double golden_ratio     = 1.61803398874989;
+  };
+}
+
+#endif