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References to 'upper set'
1. continuous relation by CWoo
2. fence by CWoo
3. height of an element in a poset by CWoo
4. ideal completion of a poset by CWoo
5. lattice ideal by CWoo
6. order ideal by CWoo
7. ordered space by CWoo
8. ordinal space by CWoo
9. partial ordering in a topological space by CWoo
10. residuated by CWoo
11. residuated lattice by CWoo
12. Scott topology by CWoo
13. upper set operation is a closure operator by rspuzio