How to Slice a Bagel into Two Linked Halves (2009) • Hacker News Board

Re: How to Slice a Bagel into Two Linked Halves (2009)

#21

Post by sizzzzlerz » Fri, Jan 26, 2018, 6:34 PM UTC

Clearly, a candidate for inclusion in one of the fine academic journals on mathematics. Or the Martha Bakes cookbook.

Either way, bravo!

Re: How to Slice a Bagel into Two Linked Halves (2009)

#22

Post by ihaveajob » Fri, Jan 26, 2018, 6:38 PM UTC

jcoffland wrote: post #12

ihaveajob wrote: post #7

Exercise to the reader: How do you slice the bagel so that you can spread cream cheese continuously along both sides. In other words, can you make a Möbious bagel?

Leave it uncut. It already has a continuous surface.

But then you can't spread on the soft side.

Re: How to Slice a Bagel into Two Linked Halves (2009)

#23

Post by ihaveajob » Fri, Jan 26, 2018, 6:39 PM UTC

ihaveajob wrote: post #7

Exercise to the reader: How do you slice the bagel so that you can spread cream cheese continuously along both sides. In other words, can you make a Möbious bagel?

I should document this and make it my first HN post.

Re: How to Slice a Bagel into Two Linked Halves (2009)

#24

Post by ihaveajob » Fri, Jan 26, 2018, 6:41 PM UTC

tzahola wrote: post #16

Now do it with a mug.

All the pictures in that link already show a mug.

Re: How to Slice a Bagel into Two Linked Halves (2009)

#25

Post by joncrane » Fri, Jan 26, 2018, 6:49 PM UTC

It turns out there's a sequel! http://www.georgehart.com/bagel/knot.html

Re: How to Slice a Bagel into Two Linked Halves (2009)

#26

Post by ng-user » Fri, Jan 26, 2018, 7:00 PM UTC

ihaveajob wrote: post #22

jcoffland wrote: post #12

Earlier quoted context omitted.

Leave it uncut. It already has a continuous surface.

But then you can't spread on the soft side.

Spreading on the 'soft side' wasn't in the requirements.

Re: How to Slice a Bagel into Two Linked Halves (2009)

#27

Post by jweather » Fri, Jan 26, 2018, 7:12 PM UTC

Numberphile video on this topic, including 3d-printed examples of some higher-order slicings: https://www.youtube.com/watch?v=3_VydFQmtZ8

Re: How to Slice a Bagel into Two Linked Halves (2009)

#28

Post by Whitespace » Fri, Jan 26, 2018, 7:14 PM UTC

Here's George Hart's daughter Vi Hart making a Mexihexaflexagon, which is a kind of three-sided flat quesadilla: https://www.youtube.com/watch?v=GTwrVAbV56o

That family must have the best picnics!

Re: How to Slice a Bagel into Two Linked Halves (2009)

#29

Post by qrbLPHiKpiux » Fri, Jan 26, 2018, 7:16 PM UTC

Video tutorial please.

Re: How to Slice a Bagel into Two Linked Halves (2009)

#30

Post by dumbfounder » Fri, Jan 26, 2018, 7:29 PM UTC

ihaveajob wrote: post #23

ihaveajob wrote: post #7

Exercise to the reader: How do you slice the bagel so that you can spread cream cheese continuously along both sides. In other words, can you make a Möbious bagel?

I should document this and make it my first HN post.

Don't you have a job?