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. 2014 May 8;6:21. doi: 10.1186/1758-2946-6-21

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Copyright © 2014 Hanser et al.; licensee Chemistry Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Combining hypotheses. The abstraction of the hypotheses permits new ways of combining knowledge units to be defined. Creating hypothesis combination operators is possible; in this figure hypothesis h_a and h_b are combined using a conjunction operator to produce h_ab. If h_ab is a valuable unit of knowledge (e.g. provides enough information gain) then it can be kept and inserted in the knowledge. This is a form of meta-learning.