Abstract
The notion ‘pasting sum’ \(\underline{\underline {F\omega }}\) (P i , ℒ i ) of two R 2-planes (or Salzmann planes) (P i , ℒ i ) is developed. Necessary and sufficient conditions for it to be an R 2-plane again are given. The notion is applied to classify all flat projective planes whose collineation group contains a sub-group Δ with (isomorphism type of Δ, fixed element configuration)=(ℝ2, x).
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Groh, H. Pasting of R 2-planes. Geom Dedicata 11, 69–98 (1981). https://doi.org/10.1007/BF00183191
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DOI: https://doi.org/10.1007/BF00183191