Klasyfikacja uogólnionych ognisk i uogólnionych kierownic stożkowych płaskich

This paper quotes author's definitions [1] and illustrates them with some drawings. Variability intervals for radii and centres of generalised foci and variability intervals for generalis.d di.".trices are given for two sets F and G of these concepts introduced for an łtp,. and a hyperbola and for its set F for a parabola The sets are divided into five and four subsets, respectively, according to the work [l]. (The division is justified by the drawing 4, quoted from the work [l], that suggests geometrical interpretation of these generalised concepts.)