| Directions in computer algebra |
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| Regions with W* > 0 are shaded, the boundaries being the roots to W*= 0. There are four directions as well as x=0 and theta = pi/2 along which the product of the Weyl tensor and its dual need not diverge. None of these correspond to directions along which the square of the Weyl tensor need not diverge. The values of this scalar shown are 5, 1, 0.05, 0.005, 0.0005, 0, -0.005, -0.0368, -1, -5. The diagram holds for all Kerr balck holes (x=r/a, a is not zero). |