Comment #1 on issue 1438 by flor...@mickler.org: bug in intersection:  
segment - segment
http://code.google.com/p/sympy/issues/detail?id=1438

attaching now test for vertical segment, which fails with current  
implementation and
a patch which solves the containment tests for vertical lines a little bit  
different
(and thus avoiding the not ( x1.atoms(C.Symbol) ) and other things, making  
the code
clearer, i think)


Attachments:
        failing_test_vertical_line.patch  757 bytes
        fix_segment_contains.patch  1.4 KB

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