Osculatory sphere

to a line of double curvature), a sphere passing through four consecutive points of the curve.

See also: Osculatory

References in periodicals archive ?
[S.sup.v-l] (x, [rho]) is an osculatory sphere at x [member] [M.sup.n] iff:
Remark A.3 There exists an osculatory sphere at any point of [M.sup.n] (see [4]).