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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;
+
+/**
+ * Interface representing a <a href="http://mathworld.wolfram.com/Field.html">field</a>.
+ * <p>
+ * Classes implementing this interface will often be singletons.
+ * </p>
+ * @param <T> the type of the field elements
+ * @see FieldElement
+ * @since 2.0
+ */
+public interface Field<T> {
+
+    /** Get the additive identity of the field.
+     * <p>
+     * The additive identity is the element e<sub>0</sub> of the field such that
+     * for all elements a of the field, the equalities a + e<sub>0</sub> =
+     * e<sub>0</sub> + a = a hold.
+     * </p>
+     * @return additive identity of the field
+     */
+    T getZero();
+
+    /** Get the multiplicative identity of the field.
+     * <p>
+     * The multiplicative identity is the element e<sub>1</sub> of the field such that
+     * for all elements a of the field, the equalities a &times; e<sub>1</sub> =
+     * e<sub>1</sub> &times; a = a hold.
+     * </p>
+     * @return multiplicative identity of the field
+     */
+    T getOne();
+
+    /**
+     * Returns the runtime class of the FieldElement.
+     *
+     * @return The {@code Class} object that represents the runtime
+     *         class of this object.
+     */
+    Class<? extends FieldElement<T>> getRuntimeClass();
+
+}