This seem to be the idea Vincent Fleury have of the L2/R2 vortices!
They migrated from one stage of development to another, don’t look very much as any vortex I knew about and certainly aren’t any of the 2D vortices Fleury was talking about, rather a lousy 2D projection of wishful thinking.
In the mean time, people do things in a much better way, without evidence of the L2/R2 stuff:
Which bring us back to:
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