| 21. | It holds in a projective plane over any field, but fails for projective planes over any noncommutative division ring.
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| 22. | Lastly, there is even an example of a domain in a division ring which satisfies " neither"
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| 23. | According to Wedderburn's little theorem, any finite division ring must be commutative, and hence a finite field.
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| 24. | From the bundle theorem follows the existence of a ) a skewfield ( division ring ) and b ) an ovoid.
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| 25. | The Artin Wedderburn theorem reduces classifying simple rings over a division ring to classifying division rings that contain a given division ring.
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| 26. | The Artin Wedderburn theorem reduces classifying simple rings over a division ring to classifying division rings that contain a given division ring.
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| 27. | The Artin Wedderburn theorem reduces classifying simple rings over a division ring to classifying division rings that contain a given division ring.
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| 28. | Beginning with division rings arising from geometry, the study of noncommutative rings has grown into a major area of modern algebra.
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| 29. | Division rings can be roughly classified according to whether or not they are finite-dimensional or infinite-dimensional over their centers.
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| 30. | Failure of one of the two distributive laws brings about near-rings and near-fields instead of rings and division rings respectively.
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