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With inspiration from other libraries

There is a newer version: 2.12.15

/*
 * 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.geometry;

import java.io.Serializable;

import org.apache.commons.math3.exception.MathUnsupportedOperationException;

/** This interface represents a generic space, with affine and vectorial counterparts.
 * @see Vector
 * @since 3.0
 */
public interface Space extends Serializable {

    /** Get the dimension of the space.
     * @return dimension of the space
     */
    int getDimension();

    /** Get the n-1 dimension subspace of this space.
     * @return n-1 dimension sub-space of this space
     * @see #getDimension()
     * @exception MathUnsupportedOperationException for dimension-1 spaces
     * which do not have sub-spaces
     */
    Space getSubSpace() throws MathUnsupportedOperationException;

}