| 21. | Thus PVS can be grouped into castling equivalence classes.
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| 22. | E and F, however, fall in the same structural equivalence class.
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| 23. | In the graph there are three regular equivalence classes.
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| 24. | The resulting equivalence classes are called "'homeomorphism classes " '.
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| 25. | Such subsets are called " equivalence classes ".
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| 26. | Ordinary letters are used for the equivalence classes.
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| 27. | These bijections are right and left translations, restricted to the appropriate equivalence classes.
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| 28. | We define " K " to be the set of equivalence classes.
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| 29. | This does not work in ZFC, because the equivalence classes are too large.
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| 30. | For instance, there can be more than one Nielsen equivalence class of generators.
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