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diff --git a/Project/MathExpression.h b/Project/MathExpression.h
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+/*
+ *  Copyright (C) 2017  Thales Lima Oliveira <thales@ufu.br>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef MATHEXPRESSION_H
+#define MATHEXPRESSION_H
+
+#include "ControlElement.h"
+#include "MathExprParser.h"
+#include "OpenGLText.h"
+
+class MathExpressionForm;
+
+/**
+ * @class MathExpression
+ * @author Thales Lima Oliveira <thales@ufu.br>
+ * @date 19/12/2017
+ * @brief A generic math expression block that can perform math and conditional operations with the inputs.
+ * @file MathExpression.h
+ */
+class MathExpression : public ControlElement
+{
+   public:
+    MathExpression(int id);
+    ~MathExpression();
+
+    virtual void Draw(wxPoint2DDouble translation, double scale) const;
+    virtual bool Contains(wxPoint2DDouble position) const { return m_rect.Contains(position); }
+    virtual bool Intersects(wxRect2DDouble rect) const { return m_rect.Intersects(rect); }
+    virtual bool ShowForm(wxWindow* parent, Element* element);
+    virtual void Rotate(bool clockwise = true);
+
+    virtual bool Solve(double input, double timeStep);
+
+    virtual void UpdatePoints();
+    void AddInNode();
+    void RemoveInNode();
+
+    virtual Element* GetCopy();
+
+   protected:
+    void CalculateBlockSize(double numInNodes);
+
+    MathExprParser m_fparser;
+    wxString m_mathExpression = "sqrt(x^2 + y^2)";
+    wxString m_variables = "x,y";
+    std::vector<wxString> m_variablesVector;
+    std::vector<OpenGLText*> m_glTextInputVector;
+    OpenGLText m_symbol;
+    wxSize m_symbolSize;
+    int m_maxSringSize = 0;
+    double m_minimumSize = 36.0;
+};
+
+#endif  // MATHEXPRESSION_H