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References to 'pre-order'
1. cover by mps
2. directed set by yark
3. endomorphism by porton
4. eventual property by CWoo
5. nerve by mhale
6. operations on relations by CWoo
7. partial ordering in a topological space by CWoo
8. poset by mps
9. preorder as a category by CWoo
10. semiring by mps
11. simplicial category by mhale
12. superset by yark
13. topic entry on order theory by CWoo
14. well quasi ordering by CWoo