||Stagnaro, Alberto and Archenti, Anibal R.
||ECPAS. Espacios de Control Puntual de Acción Simultánea
||III Congreso Iberoamericano de Grafico Digital [SIGRADI Conference Proceedings] Montevideo (Uruguay) September 29th - October 1st 1999, pp. 137-140
||The simultaneous action punctual control spaces, its species and its degrees of freedom are defined. It is proved that all of them follow the same parametric equation. A particular study of trifocus is made and the sections of the trifocoide are established the topological space where are the points that are at the minimal distance to other any three points of the plane is founded. It is proved that any ECPAS curve with coplanar focus has any number of spatial focus if this number is a multiple of the number of focus in its plane and in particular that the spatial ellipse focus are on his conjugated hyperbola.
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