# What are hyperfuncoids isomorphic to?

 Importance: Medium ✭✭
 Author(s): Porton, Victor
 Subject: Topology
 Keywords: hyperfuncoids multidimensional
 Posted by: porton on: December 9th, 2014

Let be an indexed family of sets.

Products are for .

Hyperfuncoids are filters on the lattice of all finite unions of products.

Problem   Is a bijection from hyperfuncoids to:
\item prestaroids on ; \item staroids on ; \item completary staroids on ?

If yes, is defining the inverse bijection? If not, characterize the image of the function defined on .

Consider also the variant of this problem with the set replaced with the set of complements of elements of the set .

It's used notation from Algebraic General Topology draft book

## Bibliography

* indicates original appearance(s) of problem.