Home›Browse›real projective plane🌐EnglishEnglishEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусский中文日本語EntityQ633815· pop 15· linked from 123 articlesreal projective planeSign in to savea compact non-orientable two-dimensional manifoldAvailable in 15 languagesEspañolFrançais中文日本語РусскийPortuguêsCzechEsperantoFinnishGreekNederlandsPolskiSlovenianUkrainianvia Wikidata sitelinks · CC0