News for hackers. Stuff that matters.

A comment on Penrose: Create diagrams by typing mathematical notation in plain text.

Re:Penrose: Create diagrams by typing mathematical notation ... by alanbernstein on Sunday May 10, 2020 @08:53PM (#23137807)
Penrose is a neat name for this. At first I thought it was not a great choice because of other associated concepts. Then I noticed pen=write, rose=draw. Maybe not intentional, but cute.
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by contravariant on Monday May 11, 2020 @06:12AM (#23140545)
It's going to get very confusing for people googling 'penrose diagrams' though.
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by taliesinb on Monday May 11, 2020 @09:25AM (#23141835)
Yes indeed! Does anyone know of software for creating Penrose diagrams?
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by nikofeyn on Monday May 11, 2020 @03:57AM (#23139833)
roger penrose is a famous mathematician, who did a lot of work in mathematical physics. he is also famous for a highly visual approach, such as penrose tiles.
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by toomim on Monday May 11, 2020 @04:29AM (#23140019)
Here's an example of penrose tiles:

https://dglittle.github.io/cdn/penrose002.html

It's an infinite plane of tiles, procedurally generated, that never repeats no matter how far you go.

[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by iainmerrick on Monday May 11, 2020 @04:59AM (#23140165)
Just to close the loop here, Penrose is also famous (to his readers, anyway) for his beautiful hand-drawn diagrams and illustrations. So it’s a terrific name for this project.
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by jcranmer on Monday May 11, 2020 @09:43AM (#23142022)
And has five-fold symmetry, which is impossible for wallpaper groups.

The discovery of Penrose tilings is partially tangled up with the discovery of quasicrystals, where researchers found minerals with 5-fold and 10-fold symmetry that ought to have been mathematically impossible to exist. Turns out that the Crystallographic Restriction Theorem has an important caveat that people neglected up until the 1980s: it assumes that you have to have translational symmetry, which Penrose tilings do not.

[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by Buge on Sunday May 10, 2020 @11:23PM (#23138625)
How are rose and draw related? Is it that people sometimes draw pictures of roses?
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by alanbernstein on Monday May 11, 2020 @12:06AM (#23138820)
In my mind, it was obvious that I was thinking of this: https://mathworld.wolfram.com/Rose.html. Clearly I should have mentioned that. It's the type of shape drawn by a spirograph, a pen-rose.
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by chii on Monday May 11, 2020 @12:17AM (#23138859)
penrose is the name of a famous mathematician/logician, so it's a double entendre on both it being for drawing (the pen and the rose), as well as it being for maths.
[ Parent | on HN ]
Re:Penrose: Create diagrams by typing mathematical notation ... by macromagnon on Sunday May 10, 2020 @10:36PM (#23138377)
I thought it was going to be tilings in the plane but the example is some set properties which produces a venn diagram.

The notation feels c like.

Maybe it could be interesting for knots and complicated algebraic geometry?

[ Parent | on HN ]