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Common Transversals and Tangents: Second Approach
Study the curve in P1x P1 defined by the
tangency condition more closely. There are two main cases of
which we will only consider the so-called asymmetric case here:
In this case, the ideal I is generated by el-g2,
ek-gf, ak-dc, ah-c2 and the 2-minors of the matrix
where
 .  .
The
SINGULAR
computation.
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