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Feb 26, 2010 at 22:55 comment added Anton Petrunin Well, I do not know an other way to see it...
Feb 26, 2010 at 22:34 comment added Petya It is not $f$, it is unnamed third function! I see you really like ruled surfaces.
Feb 26, 2010 at 16:27 comment added Anton Petrunin Yes it is better than mine. I would add that the function $f$ can bee constructed exactly the same way as $h_3$ in my answer.
Feb 26, 2010 at 16:14 history edited Petya CC BY-SA 2.5
added 141 characters in body; added 2 characters in body
Feb 26, 2010 at 16:01 history answered Petya CC BY-SA 2.5