In mathematics, specifically in order theory and functional analysis, an element of an ordered topological vector space is called a quasi-interior point of the positive cone of if and if the order interval is a total subset of ; that is, if the linear span of is a dense subset of [1]

Properties

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If   is a separable metrizable locally convex ordered topological vector space whose positive cone   is a complete and total subset of   then the set of quasi-interior points of   is dense in  [1]

Examples

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If   then a point in   is quasi-interior to the positive cone   if and only it is a weak order unit, which happens if and only if the element (which recall is an equivalence class of functions) contains a function that is   almost everywhere (with respect to  ).[1]

A point in   is quasi-interior to the positive cone   if and only if it is interior to  [1]

See also

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References

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  1. ^ a b c d Schaefer & Wolff 1999, pp. 234–242.

Bibliography

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  • Narici, Lawrence; Beckenstein, Edward (2011). Topological Vector Spaces. Pure and applied mathematics (Second ed.). Boca Raton, FL: CRC Press. ISBN 978-1584888666. OCLC 144216834.
  • Schaefer, Helmut H.; Wolff, Manfred P. (1999). Topological Vector Spaces. GTM. Vol. 8 (Second ed.). New York, NY: Springer New York Imprint Springer. ISBN 978-1-4612-7155-0. OCLC 840278135.