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diff --git a/src/main/java/org/apache/commons/math3/optimization/BaseMultivariateSimpleBoundsOptimizer.java b/src/main/java/org/apache/commons/math3/optimization/BaseMultivariateSimpleBoundsOptimizer.java
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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.optimization;
+
+import org.apache.commons.math3.analysis.MultivariateFunction;
+
+/**
+ * This interface is mainly intended to enforce the internal coherence of Commons-FastMath. Users of
+ * the API are advised to base their code on the following interfaces:
+ *
+ * <ul>
+ *   <li>{@link org.apache.commons.math3.optimization.MultivariateOptimizer}
+ *   <li>{@link org.apache.commons.math3.optimization.MultivariateDifferentiableOptimizer}
+ * </ul>
+ *
+ * @param <FUNC> Type of the objective function to be optimized.
+ * @deprecated As of 3.1 (to be removed in 4.0).
+ * @since 3.0
+ */
+@Deprecated
+public interface BaseMultivariateSimpleBoundsOptimizer<FUNC extends MultivariateFunction>
+        extends BaseMultivariateOptimizer<FUNC> {
+    /**
+     * Optimize an objective function.
+     *
+     * @param f Objective function.
+     * @param goalType Type of optimization goal: either {@link GoalType#MAXIMIZE} or {@link
+     *     GoalType#MINIMIZE}.
+     * @param startPoint Start point for optimization.
+     * @param maxEval Maximum number of function evaluations.
+     * @param lowerBound Lower bound for each of the parameters.
+     * @param upperBound Upper bound for each of the parameters.
+     * @return the point/value pair giving the optimal value for objective function.
+     * @throws org.apache.commons.math3.exception.DimensionMismatchException if the array sizes are
+     *     wrong.
+     * @throws org.apache.commons.math3.exception.TooManyEvaluationsException if the maximal number
+     *     of evaluations is exceeded.
+     * @throws org.apache.commons.math3.exception.NullArgumentException if {@code f}, {@code
+     *     goalType} or {@code startPoint} is {@code null}.
+     * @throws org.apache.commons.math3.exception.NumberIsTooSmallException if any of the initial
+     *     values is less than its lower bound.
+     * @throws org.apache.commons.math3.exception.NumberIsTooLargeException if any of the initial
+     *     values is greater than its upper bound.
+     */
+    PointValuePair optimize(
+            int maxEval,
+            FUNC f,
+            GoalType goalType,
+            double[] startPoint,
+            double[] lowerBound,
+            double[] upperBound);
+}