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Concordance<br />

Soient f 0 , f 1 : n × S 1 ↩→ R 3 deux entrelacs.<br />

Définition (concordance)<br />

Une concordance est un plongement F : n × S 1 × I ↩→ R 3 × I<br />

de sorte que F 0 = f 0 × id {0} et F 1 = f 1 × id {1} .<br />

La concordance définit une relation d’équivalence,<br />

plus faible que l’isotopie, plus forte que le bordisme.

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