Definition: if for any two teams (A, B) in the NFL, there exists a sequence of teams t_1 to t_k such that A beat t_1 beat t_2 .... beat t_k beat B.
Examples:


Current Status as of week 5:
Eagles and 49ers undefeated
Panthers winless
Vikings only beat Panthers
Exists a circle of parity for other 28 teams
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@MattLashofSullivan I believe it was true for the 2023 season at the time of publishing the question.
In other words, as of week 5, there was no such scenario since the Eagles and 49ers aren't in the same division and the Panthers were the only winless team
@ChinmayTheMathGuy yeah I'm just saying "there exists a circle of parity" and "there exist no undefeated or winless teams" are not logically equivalent claims, which the title to this market claims they are.
@ChinmayTheMathGuy The part I'm unsure (but still mostly confident) about is if the definition I provided implies the existence of a circle of parity with each of the 32 teams included exactly once. Obviously the converse is true.
@MattLashofSullivan the title includes "in the 2023 NFL Regular Season" so it's a valid claim.