The real projective plane
Immersions of the projective plane
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Immersion of the projective plane discovered by Werner Boy in the early 1900s
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The crosscap is an immersion of the projective plane with a singularity.
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Immersion of the projective plane first described by Jakob Steiner, with six singularities.
Boy’s surface, a projective space smoothly existing in a three dimensional world
Boy’s Other Surface
The crosscap
The Steiner Roman Surface
