#quadrangle

[ahhphoto]

[postcard-from-the-past]

Quadrangle Trinity Hospital in Clun, Shropshire, England

British vintage postcard

[beanstalk-guy]

It’s come to my attention that I use the word quadrangle for my rectangular neighborhood little compound. I don’t use block, or anything normal. I use FUCKING QUADRANGLE.

Anyways, I love my mutual quadrangle-ish (quindrangle? Is that even a word?)

@that-bookworm-bitch , @deadgaychoirkid , @lindamonroequeenb , @literal-m0nster , and me :} So I guess it is a quindrangle

[wyrmscraft]

Free pattern Quadrangle by Moda. I bought a very cute christmas jelly roll and picked an off white background and matching red for the accent and off I go.

[fanatic1998new]

Hey, so I’m writing a sci-fi novel and I’m wondering what Mars Quadrangle would have the best view of Earth.

One of the poles?

North?

South?

Equator?

Thanks for your help you guys!

[vanishingsydney]

Stone mason's gargoyle. High up in the Sydney Sandstone cloisters of the gothic revival Quadrangle (1855-1966), The University of Sydney. Near the old Philosophy classrooms. Camperdown.

[curiosamathematica]

Take a set of six elements, {a, b, c, d, e, f}. Every pair of elements is called a duad. A triple ot three duads that partition the original set, such as {a, d}, {b, c}, {e, f}, is called a syntheme. A quick check shows that there are 15 possible duads in total, and also 15 synthemes.

We can adopt a more geometric viewpoint by declaring the duads to be “points” and the synthemes to be “lines” through three such “points”. Then—if we allow to curve the “lines” to make our life easier—we obtain the figure above. In this form, the configuration is known as the doily.

One defining property is that no three “points” make a “triangle” of three “lines” in this structure. But, if we look at any “point” P not on a “line” L, then there is a unique “point” Q on L such that P and Q lie on a “line”. Hence this configuration does not contain combinatorial “triangles”, but it does contain lots of “quadrangles”. It makes it a prime example of a generalised quadrangle.

With a slightly different viewpoint we can realise this configuration using only familiar straight lines; this version is known as the Cremona–Richmond configuration.

[iowacitypast]

Quadrangle soda room and cafeteria serving line, The University of Iowa, 1935

Creator: Kent, Frederick Wallace 

Soda Foundation Room, cafeteria, gift of Hugh Wolff, M.D.

https://digital.lib.uiowa.edu/islandora/object/ui%3Aictcs_25198