In the plane Every continuous function from a closed disk to itself has at least one fixed point.D. Violette Applications du lemme de Sperner pour les triangles Bulletin AMQ, V. XLVI N° 4, (2006) p 17.
In the plane Every continuous function from a closed disk to itself has at least one fixed pointD Violette Applications du lemme de Sperner pour les triangles Bulletin AMQ V XLVI N° 4 (2006) p 17