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Tensorics is a java framework which uses a tensor as a central object. A tensor represents a set of values placed in an N-dimensional space. Wherever you are tempted to use maps of maps, a tensor might be a good choice ;-) Tensorics provides methods to create, transform and performing calculations with those tensors.

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// @formatter:off
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 * This file is part of tensorics.
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 * Copyright (c) 2008-2011, CERN. All rights reserved.
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 * Licensed 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
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing, software
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// @formatter:on

package org.tensorics.core.math.operations;

/**
 * Represents a binary operation which guarantees that it is associative. In other words:
 * 
 * Let a,b and c being elements of an mathematical structure, 'o' representing the operation. Then the following is
 * valid: (a o b) o c = a o (b o c).
 * 
 * @author kfuchsbe
 * @param  the type of the elements to which this operation can be applied.
 * @see http://en.wikipedia.org/wiki/Associative
 */
public interface AssociativeOperation extends BinaryOperation {
    /* Only a marker */
}