Geodesic
Natural Partial Orders
Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 535-554

Voir la notice de l'article provenant de la source Cambridge University Press

Let n be an ordinal. A partial ordering P of the ordinals T = T(n) = {w: w < n} is called natural if x P y implies x ⩽ y.A natural partial ordering, hereafter abbreviated NPO, of T(n) is thus a coarsening of the natural total ordering of the ordinals. Every partial ordering of a finite set 5 is isomorphic to a natural partial ordering. This is a consequence of the theorem of Szpielrajn (5) which states that every partial ordering of a set may be refined to a total ordering. In this paper we consider only natural partial orderings. In the first section we obtain theorems about the lattice of all NPO's of T(n). 
Dean, R. A.; Keller, Gordon. Natural Partial Orders. Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 535-554. doi: 10.4153/CJM-1968-055-7
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