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diff --git a/src/main/java/org/apache/commons/math3/optimization/MultivariateOptimizer.java b/src/main/java/org/apache/commons/math3/optimization/MultivariateOptimizer.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 represents an optimization algorithm for {@link MultivariateFunction scalar
+ * objective functions}.
+ *
+ * <p>Optimization algorithms find the input point set that either {@link GoalType maximize or
+ * minimize} an objective function.
+ *
+ * @see MultivariateDifferentiableOptimizer
+ * @see MultivariateDifferentiableVectorOptimizer
+ * @deprecated As of 3.1 (to be removed in 4.0).
+ * @since 2.0
+ */
+@Deprecated
+public interface MultivariateOptimizer extends BaseMultivariateOptimizer<MultivariateFunction> {}