6533b7d9fe1ef96bd126c0a5

RESEARCH PRODUCT

On a-semiaffine planes with invisible lines

Albrecht BeutelspacherInge Schestag

subject

Differential geometryHyperbolic geometryGeometryGeometry and TopologyAlgebraic geometryTopology (chemistry)MathematicsProjective geometryhttps://doi.org/10.1007/bf00181604