From some 1949 remarks of Weyl— "The relativity problem is one of central significance throughout geometry and algebra and has been recognized as such by the mathematicians at an early time."
— Hermann Weyl, "Relativity Theory as a Stimulus in Mathematical Research," Weyl in 1946—:
"This is the relativity problem: to fix objectively
— Hermann Weyl, |

For some context, see *Relativity Problem* in this journal.

In the case of PG(3,2), there is a choice of geometric models

to be coordinatized: two such models are the traditional

tetrahedral model long promoted by Burkard Polster, and

the square model of Steven H. Cullinane.

The above Wikipedia section tacitly (and unfairly) assumes that

the model being coordinatized is the tetrahedral model. For

coordinatization of the square model, see (for instance) the webpage

Finite Relativity.

For comparison of the two models, see a figure posted here on

May 21, 2014 —

**Labeling the Tetrahedral Model** (Click to enlarge) —

**"Citation needed" —**

The anonymous characters who often update the PG(3,2) Wikipedia article

probably would not consider my post of 2014, titled "The Tetrahedral

Model of PG(3,2)," a "reliable source."