In 1972, a few months after his retirement, Petrie was killed by a car while attempting to cross a motorway near his home in Surrey.
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John Flinders Petrie (1907-1972) was the only son of Egyptologist Sir W. M. Flinders Petrie.
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The plane in question is the Coxeter plane of the symmetry group of the polygon, and the number of sides, h, is Coxeter number of the Coxeter group.
Flinders Petrie | polygon | William Petrie | Thomas Petrie | Stewart Petrie | regular polygon | Petrie | John Petrie | Geoff Petrie | The Polygon, Southampton | Polygon triangulation | polygon (computer graphics) | Polygon | Petrie Island | Karen Petrie | Henry W. Petrie | Haylea Petrie | George Petrie | General Polygon Clipper | Gavin Petrie | Doug Petrie | Donald Petrie | David Petrie | Constance Campbell Petrie | Charles Robert Petrie |