Hans-Peter E. Kristiansen

445 reputation

312

bio	website	none
	location	Aarhus, Denmark
	age	36
visits	member for	1 year, 5 months
	seen	May 6 at 21:28
stats	profile views	32

Stud. Scient. Casual LaTeX user. TikZ newbie.

	445 reputation	bio	website	none	visits	member for	1 year, 5 months
312 badges		location	Aarhus, Denmark		seen	May 6 at 21:28

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32 Actions

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May 6	awarded	Caucus
Dec 15	awarded	Yearling
Aug 12	awarded	Scholar
Aug 12	accepted	Are non-circular manholes possible?
Aug 12	comment	Are non-circular manholes possible? This is not a complete answer, but it provides a non-circular example. I believe that a full description of all shapes will be too difficult, so I will accept this answer.
Aug 1	comment	Are non-circular manholes possible? @BrunoLeFloch: Yes your variant(it can be simplified to a infinite shaft - no plane is needed) is arguably more beautiful.
Aug 1	revised	Are non-circular manholes possible? added 103 characters in body
Aug 1	awarded	Self-Learner
Aug 1	awarded	Teacher
Aug 1	comment	Are non-circular manholes possible? @MichaelHardy: I do not think that they are the only ones - see my own answer.
Aug 1	answered	Are non-circular manholes possible?
Jul 31	awarded	Commentator
Jul 31	comment	Are non-circular manholes possible? @MichaelHardy: Your answer is by far the best, as it gives an example of a useful manhole cover. -but I am still hoping for examples of other weird shapes that would work. -and maybe a description of what properties these shapes needs to obey.
Jul 31	comment	Are non-circular manholes possible? "Are non-circular manholes possible?" is the title meant to intrigue you. I am interested in the math. If you wanted to you could build a triangular purple manhole cover in styrofoam - I do not care. -1
Jul 31	comment	Are non-circular manholes possible? I specified the cover to be flat rigid and the same shape of the hole. Obviously you can cover a small hole with a big cover.
Jul 31	awarded	Critic
Jul 31	comment	Are non-circular manholes possible? Your answer surely is interesting reading, but it does not help solve the problem.
Jul 31	comment	Are non-circular manholes possible? I do not know why this answer got so many votes. Maybe I did not write clearly enough what the problem is. -or have I misunderstood this answer?
Jul 31	comment	Are non-circular manholes possible? @MarkDominus: I would like to see one shape, that obviously does not fit thru its own hole. Can you draw it and post?
Jul 31	awarded	Editor