The pseudo-tangent cone 
of a subset 
at a point 
is the set
 |
where 
is the contingent cone of 
and where 
is the smallest convex set
in 
containing 
.
Pseudo-Tangent Cone
See also
Contingent Cone, Convex, Convex Hull, SubsetThis entry contributed by Christopher Stover
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References
Borwein, J. and Lewis, A. Convex Analysis and Nonlinear Optimization: Theory and Examples. New York: Springer Science+Business Media, 2006.Referenced on Wolfram|Alpha
Pseudo-Tangent ConeCite this as:
Weisstein, Eric W., with contributions by Christopher Stover. "Pseudo-Tangent Cone." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Pseudo-TangentCone.html