Based on BP30, "curve with exactly one self-crossing vs. curve without a self-crossing". This is just a slightly more general version.

Curves with at least one crossing vs. curves do not cross.

Curve with at least one self-crossing vs. curve without a self-crossing.

Based on BP30, "curve with exactly one self-crossing vs. curve without a self-crossing".

EX6881

Aaron David Fairbanks