Re:How to Slice a Bagel into Two Linked Halves
by huhtenberg on Thursday April 18, 2013 @07:48AM
(#5569997)
Neat, but academic, because as everyone undoubtedly knows slicing bagel into a Mobius strip is far more practical. Not only does it give you a surface for jam-and-buttering, but also keeps the construct in a single piece ensuring an unbeatable simplicity and predictability of the user experience. It's the same technique as in the article, but the knife needs to rotate at the half of its angular speed as it goes along bagel's diameter.
Re:How to Slice a Bagel into Two Linked Halves
by up_and_up on Thursday April 18, 2013 @11:34AM
(#5571200)
> It is much more fun to put cream cheese on these bagels than on an ordinary bagel. In additional to
the intellectual stimulation, you get more cream cheese, because there is slightly more surface area.
Re:How to Slice a Bagel into Two Linked Halves
by GuiA on Thursday April 18, 2013 @03:04AM
(#5569271)
And Erik Demaine is the son of the prodigal Martin Demaine. It seems that some mathematicians are good at communicating their passion to their children.
Re:How to Slice a Bagel into Two Linked Halves
by emillon on Thursday April 18, 2013 @03:42AM
(#5569358)
This construction shows Villarceau circles[1], which are the nontrivial circle sections of a torus. This can be also seen on the POV raytracer hall of fame[2].
Re:How to Slice a Bagel into Two Linked Halves
by mauvehaus on Thursday April 18, 2013 @09:37AM
(#5570479)
I have a number of friends who are middle and high school math teachers. I have asked them to demonstrate this for their students and report back on how utterly blown their students' minds are.
Stuff like this makes me wish I had continued on the path of becoming a math teacher myself rather than returning to the world of software.
Re:How to Slice a Bagel into Two Linked Halves
by a_p on Thursday April 18, 2013 @06:09PM
(#5573466)
The rest of George Hart's site is interesting as well, especially his encyclopedia of virtual polyhedra [1]. There is also a part 2 of "Mathematically Correct Breakfast" (this time a trefoil knot) [2], and his sculptures are worth looking at as well [3].
Re:How to Slice a Bagel into Two Linked Halves
by gojomo on Thursday April 18, 2013 @05:06AM
(#5569568)
I suspect you could bake two interlocked bagel rings with a little help from a baking sheet that had angled U-shaped cutouts. You'd mold the rings while the dough was soft, and the baking sheet would help support the rings, as separate but interlocked, during baking. (To me, this feels like less of a challenge than the cutting trick.)
Re:How to Slice a Bagel into Two Linked Halves
by Samuel_Michon on Thursday April 18, 2013 @10:37AM
(#5570813)
That won’t work, as the dough isn’t soft enough before it is baked. By that time, the dough has been shaped, risen for 36 hours and boiled. Baking is a pretty minor step in the process.
Re:How to Slice a Bagel into Two Linked Halves
by gojomo on Thursday April 18, 2013 @06:16PM
(#5573509)
Thanks for the reference... seems the proper accessory would need to be something that helps hold the two in the proper position through rising/boiling. Maybe something in high-temperature silicone? (And yes, it'd certainly force a different hole-to-ring proportion...) Needs experiments!
Re:How to Slice a Bagel into Two Linked Halves
by Samuel_Michon on Thursday April 18, 2013 @08:06PM
(#5573963)
Sure, that could work. I think it comes down to the definition of a bagel. Most bagels you can buy in the store don't meet my definition, that's partially why this exercise is so challenging for me. I will definitely try to find a solution, though. The idea appeals to me.
—Ashkenazi Jew, my grandmother taught me how to make bagels. It's quite a process, when done properly.
Re:How to Slice a Bagel into Two Linked Halves
by Samuel_Michon on Thursday April 18, 2013 @10:54AM
(#5570931)
I don’t see how that could work. You’d either have to split the bagels before boiling, which would turn them into Frankenbagels while boiling, or you’d have to forego the boiling step, which would make it a roll with a hole – not a bagel.
Re:How to Slice a Bagel into Two Linked Halves
by Retric on Thursday April 18, 2013 @09:53AM
(#5570579)
Normally you take a knife slice a bagel down the middle and you end up with 2 half's but part of that action ends up cutting both sides of the hole at the same time.
Instead take a knife cut to the center but not the other side then as you cut around the edge rotate the cut so by the time your around the full bagel the knife is upside down. If you picture it at one point knife handle is on the above the bagel and after a little while it's below the bagel. The only trick is to make you cut line up when your done.
Re:How to Slice a Bagel into Two Linked Halves
by Evbn on Thursday April 18, 2013 @10:46AM
(#5570867)
I have tried these cuts a dozen times, never with success. What kind of knife/dough do you need to make clean cuts? 10 year olds can do it in two tries, why can't I?
Re:How to Slice a Bagel into Two Linked Halves
by lessnonymous on Thursday April 18, 2013 @08:58AM
(#5570317)
Missed the Hacker News on this one ..
I know I'm not heavily karma'd and so my opinion counts for less, but this isn't the sort of thing I'm expecting on HN. This belongs over in Reddit (where I promise I'll still see it .. probably reposted a dozen times)
Re:How to Slice a Bagel into Two Linked Halves
by lessnonymous on Thursday April 18, 2013 @10:30PM
(#5574411)
Thanks for pointing me to those.
I also missed this one:
> If your account is less than a year old, please don't submit comments saying that HN is turning into Reddit. (It's a common semi-noob illusion.)
I'm only up to 326 days, so I'll go back to my corner and apologize (genuinely) for not being aware of these rules.
Yeah, but if you drop it on the floor it is guaranteed to land jam-side-down 100% of the time.
I believe this is winning on all fronts here.
Stuff like this makes me wish I had continued on the path of becoming a math teacher myself rather than returning to the world of software.
[1] http://www.georgehart.com/virtual-polyhedra/vp.html
[2] http://www.georgehart.com/bagel/knot.html
[3] http://www.georgehart.com/sculpture/sculpture.html
http://news.ycombinator.com/item?id=982249 http://news.ycombinator.com/item?id=1234503 http://news.ycombinator.com/item?id=1967930
This story has allotted a total of 656 karma, interesting.
You misspelt 'sliced'.
http://www.genuineideas.com/ArticlesIndex/bagels.html
—Ashkenazi Jew, my grandmother taught me how to make bagels. It's quite a process, when done properly.
Instead take a knife cut to the center but not the other side then as you cut around the edge rotate the cut so by the time your around the full bagel the knife is upside down. If you picture it at one point knife handle is on the above the bagel and after a little while it's below the bagel. The only trick is to make you cut line up when your done.
I know I'm not heavily karma'd and so my opinion counts for less, but this isn't the sort of thing I'm expecting on HN. This belongs over in Reddit (where I promise I'll still see it .. probably reposted a dozen times)
Complaining is just noise.
I also missed this one: > If your account is less than a year old, please don't submit comments saying that HN is turning into Reddit. (It's a common semi-noob illusion.)
I'm only up to 326 days, so I'll go back to my corner and apologize (genuinely) for not being aware of these rules.
Though I still don't think it belongs here ;-D
submission title: Includes phrase 'Linked'
Contains everything necessary for hip pseudo-hacker karma.
http://ycombinator.com/newsguidelines.html
The Internet is a much bigger place than some people realize.