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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.
+ */
+package org.apache.commons.math3.analysis.differentiation;
+
+import org.apache.commons.math3.analysis.UnivariateFunction;
+import org.apache.commons.math3.exception.DimensionMismatchException;
+
+/** Interface for univariate functions derivatives.
+ * <p>This interface represents a simple function which computes
+ * both the value and the first derivative of a mathematical function.
+ * The derivative is computed with respect to the input variable.</p>
+ * @see UnivariateDifferentiableFunction
+ * @see UnivariateFunctionDifferentiator
+ * @since 3.1
+ */
+public interface UnivariateDifferentiableFunction extends UnivariateFunction {
+
+    /** Simple mathematical function.
+     * <p>{@link UnivariateDifferentiableFunction} classes compute both the
+     * value and the first derivative of the function.</p>
+     * @param t function input value
+     * @return function result
+     * @exception DimensionMismatchException if t is inconsistent with the
+     * function's free parameters or order
+     */
+    DerivativeStructure value(DerivativeStructure t)
+        throws DimensionMismatchException;
+
+}