English Conical surface Cited by user David Eppstein on 27 Jan 2024 In geometry, a conical surface is a three-dimensional surface formed from the union of lines that pass through a fixed point and a space curve.
English Confocal conic sections Cited by user Jacobolus on 13 Jan 2023 In geometry, two conic sections are called confocal if they have the same foci.
English Georg Glaeser Cited by user Gusfriend on 26 Apr 2022 He studied mathematics and geometry at the TU Wien from 1973 to 1978 from where he also received his doctor's degree in 1980, advised by Walter Wunderlich.