File:150614-PG-3-2-schoolgirls-arrangement.png

150614-PG-3-2-schoolgirls-arrangement.png (333 × 439 pixels, file size: 13 KB, MIME type: image/png)

Summary

Description

Original description by Steven H. Cullinane:

Square model of Fano 3-space

This square model of PG(3,2), the projective 3-space over the 2-element Galois field GF(2), has its origin in the Cullinane diamond theorem.

The black squares in each picture depict a two-dimensional vector subspace (plane) within the vector 4-space over GF(2).

A vector 4-space over GF(2) becomes a projective 3-space when the origin of the space is deleted. In the resulting projective 3-space, vector-space planes through the origin become projective lines, with 3 rather than 4 points because the origin has been deleted. In the above image, the origin (top left subsquare) is retained, for the sake of visual symmetry. For details of the underlying geometry, see (for instance) Geometry and Symmetry by Paul B. Yale.

Original caption:
The square model of PG(3,2), the Fano 3-space.
Sets of black squares represent the 35 lines.

(This arrangement of the 35 lines illustrates the Kirkman schoolgirls problem.)
Date
Source Own work
Author Steven H. Cullinane
Other versions
arrangement related to Miracle Octad Generator
naïve arrangement

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15 June 2015

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Date/TimeThumbnailDimensionsUserComment
current15:32, 12 July 2019Thumbnail for version as of 15:32, 12 July 2019333 × 439 (13 KB)Watchduckcrop to image, remove caption
14:30, 15 June 2015Thumbnail for version as of 14:30, 15 June 2015333 × 520 (11 KB)CullinaneModified the caption (from "are" to "represent").
04:43, 15 June 2015Thumbnail for version as of 04:43, 15 June 2015333 × 520 (10 KB)CullinaneUser created page with UploadWizard

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