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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+/**
+ *
+ * <p>
+ *   This package holds the main interfaces and basic building block classes
+ *   dealing with differentiation.
+ *   The core class is {@link org.apache.commons.math3.analysis.differentiation.DerivativeStructure
+ *   DerivativeStructure} which holds the value and the differentials of a function. This class
+ *   handles some arbitrary number of free parameters and arbitrary differentiation order. It is used
+ *   both as the input and the output type for the {@link
+ *   org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction
+ *   UnivariateDifferentiableFunction} interface. Any differentiable function should implement this
+ *   interface.
+ * </p>
+ * <p>
+ *   The {@link org.apache.commons.math3.analysis.differentiation.UnivariateFunctionDifferentiator
+ *   UnivariateFunctionDifferentiator} interface defines a way to differentiate a simple {@link
+ *   org.apache.commons.math3.analysis.UnivariateFunction UnivariateFunction} and get a {@link
+ *   org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction
+ *   UnivariateDifferentiableFunction}.
+ * </p>
+ * <p>
+ *   Similar interfaces also exist for multivariate functions and for vector or matrix valued functions.
+ * </p>
+ *
+ */
+package org.apache.commons.math3.analysis.differentiation;