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References to 'linearly ordered'
1. branch by Henry
2. chain by CWoo
3. equivalence of Hausdorff's maximum principle, Zorn's lemma and the well-ordering theorem by mathcam
4. Hausdorff's maximum principle by CWoo
5. induction by Daume
6. motivation for von Neumann ordinals by yark
7. proof of Tukey's lemma by Koro
8. properties of ordinals by CWoo
9. signature of a permutation by rspuzio
10. well-founded induction by ratboy