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diff --git a/src/main/java/org/apache/commons/math3/optimization/linear/Relationship.java b/src/main/java/org/apache/commons/math3/optimization/linear/Relationship.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.linear;
+
+/**
+ * Types of relationships between two cells in a Solver {@link LinearConstraint}.
+ * @deprecated As of 3.1 (to be removed in 4.0).
+ * @since 2.0
+ */
+@Deprecated
+public enum Relationship {
+
+    /** Equality relationship. */
+    EQ("="),
+
+    /** Lesser than or equal relationship. */
+    LEQ("<="),
+
+    /** Greater than or equal relationship. */
+    GEQ(">=");
+
+    /** Display string for the relationship. */
+    private final String stringValue;
+
+    /** Simple constructor.
+     * @param stringValue display string for the relationship
+     */
+    Relationship(String stringValue) {
+        this.stringValue = stringValue;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        return stringValue;
+    }
+
+    /**
+     * Get the relationship obtained when multiplying all coefficients by -1.
+     * @return relationship obtained when multiplying all coefficients by -1
+     */
+    public Relationship oppositeRelationship() {
+        switch (this) {
+        case LEQ :
+            return GEQ;
+        case GEQ :
+            return LEQ;
+        default :
+            return EQ;
+        }
+    }
+
+}