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diff --git a/include/differentiator.hpp b/include/differentiator.hpp
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+/* PIA - Lenguajes Modernos de Programación
+ * FACULTAD DE CIENCIAS FÍSICO MATEMÁTICAS
+ * Luis Sebastián Martínez Vega - LCC */
+
+#include "expressions.hpp"
+#include <string>
+#ifndef DIFFERENTIATOR_H
+#define DIFFERENTIATOR_H
+
+class Differentiator {
+private:
+  Expression *differential;
+  Expression *ptr;
+public:
+  Differentiator();
+  Expression *visit(Literal *expr);
+  Expression *visit(Variable *expr);
+  Expression *visit(Function *expr);
+  Expression *visit(NegationExpression *expr);
+  Expression *visit(AddExpression *expr);
+  Expression *visit(SubExpression *expr);
+  Expression *visit(DivisionExpression *expr);
+  Expression *visit(MultiplicationExpression *expr);
+  Expression *visit(PowerExpression *expr);
+};
+
+#endif /* DIFFERENTIATOR_H */