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References to 'antichain'
1. complemented lattice by CWoo
2. convex subgroup by CWoo
3. dimension of a poset by CWoo
4. dual of Dilworth's theorem by justice
5. graded poset by mps
6. height of an element in a poset by CWoo
7. index of set theory by rspuzio
8. induction by Daume
9. locally finite poset by mps
10. Martin's axiom is consistent by mathcam
11. poset by mps
12. poset height and width by justice
13. product of posets by CWoo
14. Sperner's theorem by bbukh
15. Suslin tree by Henry
16. well quasi ordering by CWoo