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diff --git a/src/main/java/org/apache/commons/math3/linear/AnyMatrix.java b/src/main/java/org/apache/commons/math3/linear/AnyMatrix.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.linear;
+
+/**
+ * Interface defining very basic matrix operations.
+ *
+ * @since 2.0
+ */
+public interface AnyMatrix {
+
+    /**
+     * Is this a square matrix?
+     *
+     * @return true if the matrix is square (rowDimension = columnDimension)
+     */
+    boolean isSquare();
+
+    /**
+     * Returns the number of rows in the matrix.
+     *
+     * @return rowDimension
+     */
+    int getRowDimension();
+
+    /**
+     * Returns the number of columns in the matrix.
+     *
+     * @return columnDimension
+     */
+    int getColumnDimension();
+}