| 21. | These matrices can act either on real or complex column vectors.
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| 22. | Not all matrices have an inverse ( see invertible matrix ).
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| 23. | This property follows from the trace definition restricted to real matrices,
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| 24. | Tests include WPPSI, Raven's Progressive Matrices and Versant.
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| 25. | Examples include linear transformations and affine transformations, rotations, matrices.
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| 26. | They are secreted and incorporated into cell-associated extracellular matrices.
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| 27. | The rational 2 by 2 matrices are split at all places.
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| 28. | The Dirac matrices \ gamma ^ a are contracted onto vierbiens,
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| 29. | In practice, the element matrices are neither expanded nor rearranged.
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| 30. | This non-negativity makes the resulting matrices easier to inspect.
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