- In geometry, a
focaloid is a s****
bounded by two concentric,
confocal ellipses (in 2D) or
ellipsoids (in 3D). When the
thickness of the s**** becomes...
- rings, as can be used for tree-ring
dating Centered cube
number Homoeoid Focaloid Circular symmetry Magic circle (mathematics)
Osculating circle Spiral Circles:...
- form an
ellipse or an
ellipsoid of
revolution (spheroid), respectively.
Focaloid, a s****
bounded by two concentric,
confocal ellipsoids Geodesics on an...
- dz=abc\,s^{2}\sin \theta \,ds\,d\theta \,d\phi .}
Ellipsoidal latitude Focaloid (s****
given by two
coordinate surfaces) Map
projection of the triaxial...
-
means that a test m**** or
charge will not feel any
force inside the s****.
Focaloid Chandrasekhar, S.:
Ellipsoidal Figures of Equilibrium, Yale Univ. Press...
-
diagonals connecting opposite points have
equal length.
Apollonian circles Focaloid Hilbert & Cohn-Vossen 1952, p. 6.
Felix Klein:
Vorlesungen über Höhere...
