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Discovery of a new irregular pentagon that can cover the plane

theguardian.com

41–50 of 131 posts

Re: Discovery of a new irregular pentagon that can cover the plane

#41
post #39

Besides tiling your bathroom is there any use case for this? Or is this pure for fun and gaining knowledge? Edit: The article is talking about building structures but isn't a triangle the most rigid form? And triangles are already used in building.

Should it be discounted if it were done for pure fun?

It's a question, not an opinion. He/she might just be interested in the practicalities.

Re: Discovery of a new irregular pentagon that can cover the plane

#42
post #30

Earlier quoted context omitted.

It's a pun, not clickbait. This is not the death of "journalistic integrity".

No, the original title is clearly clickbait – meant to be misinterpreted as something other than what the article is about. Here is what a real pun in a newspaper headline looks like: http://threepanelsoul.com/2010/03/22/on-astronomy-minors/

It's a pun

PUN: Attack on the pentagon results in discovery of new mathematical tile

CB: Breaking News: Pentagon attack

Re: Discovery of a new irregular pentagon that can cover the plane

#43

Many of these types are basically combining two pentagons into an octagon (or even hexagon) then tiling it across the plane. For some reason, intuitively those seem more easy to me (2 * 3, 2 * 4), so that you could just generate a bunch of them, and split them in two to create tessellating pentagons? Even the example in the article can be viewed as a regularly tessellating nonagon. I don't see what's "irregular" abou…

irregular - with sides of different sizes

https://en.wikipedia.org/wiki/Regular_polygon

Re: Discovery of a new irregular pentagon that can cover the plane

#44
post #26

Meta question: where can I find list of simple unsolved/undiscovered problems like these in math? It does not appear in https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_m...

I don't think that tiling a plane is exactly a "simple" problem.

Why not? It seems simple to me.

Simple doesn't mean easy. Factoring a 2048 bit number is very simple and very hard.

Re: Discovery of a new irregular pentagon that can cover the plane

#45
post #5

"That same year an unlikely mathematical pioneer entered the fray: Marjorie Rice, a San Diego housewife in her 50s, who had read about James’ discovery in Scientific American. An amateur mathematician, Rice developed her own notation and method and over the next few years discovered another four types of pentagon that tile the plane. " https://en.wikipedia.org/wiki/Marjorie_Rice

Wow. I personally cannot do much work without being part of a community to share and refine ideas with. It is amazing that someone can produce important work while working essentially in isolation.

Re: Discovery of a new irregular pentagon that can cover the plane

#47
post #39

Besides tiling your bathroom is there any use case for this? Or is this pure for fun and gaining knowledge? Edit: The article is talking about building structures but isn't a triangle the most rigid form? And triangles are already used in building.

Sure there are. There are many processes where you want to "tile" a surface with identical smaller parts. I'd assume it's something that happens with solar panels. Possibly also on the molecular level with coatings etc. Having more options for the shape of the constituent parts may be an advantage.

see also https://en.wikipedia.org/wiki/Buckminsterfullerene, a molecule inspired by architecture.

Re: Discovery of a new irregular pentagon that can cover the plane

#48

"Attack on the pentagon" ...aaaand the guardian has lowered themselves to buzzfeed's standards.

Not at all. Witty headline have a long history which was unfortunately cut short by google which, at least for a while, only rewarded the most boring, literal drivel. It's good to see the tradition making a comeback.

This headline is also completely unlike the buzzfeed-clickbait headlines. Buzzfeed tries to exploit psychological weaknesses (Mathematicians attack the pentagon – you won't believe what happened next).

Headlines like the Guardian's are much better in that they're still entertaining after you've read the story. Sometimes I think they're written more for the amusement of the editor than anything else.

Other guardian headline I saved: "Blight in Italy leaves pine nut nuts pining for more"

Re: Discovery of a new irregular pentagon that can cover the plane

#50
post #39

Besides tiling your bathroom is there any use case for this? Or is this pure for fun and gaining knowledge? Edit: The article is talking about building structures but isn't a triangle the most rigid form? And triangles are already used in building.

Sure there are. There are many processes where you want to "tile" a surface with identical smaller parts. I'd assume it's something that happens with solar panels. Possibly also on the molecular level with coatings etc. Having more options for the shape of the constituent parts may be an advantage. see also https://en.wikipedia.org/wiki/Buckminsterfullerene , a molecule inspired by architecture.

And rectangles aren't good enough.
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