The problem of four lines in P3
The problem of four lines in P3 |
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In the the last stage of the specialization sequence, again nothing happens to the first solution line. Since the moving plane rotates about the line, falling into the stationary plane, the second solution also rotates to become the line in the stationary plane that meet our two fixed lines. For the first solution, this is the case (no,no) in Table2/Figure 8 of GLR, and the red checkers stay. For the second solution, this is a case of (no,yes, in the descending checker's square) of Table 2/Figure 8 in GLR. |
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