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szzheng

Could someone explain here why this is a degenerate case? It seems to be as mathematically valid as an other non-parallel line intersection case.

Lyynnn

I'm also confused about this point, can someone tell more details?

isalinas

In the lecture Kayvon mentioned lines which were parallel, and would therefore have no solution. One degenerate case might be skewed lines, where the lines are not parallel but they still don't intersect; this is the case in tetrahetron. Another is to consider the case where at least one of the lines is not continuous.