This conjecture has been shown to be false:
B. Oporowski, 'A counterexample to Seymour's self-minor conjecture.' Journal of Graph Theory, (14) 5 (521--524)
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Counterexample to Seymour's self-minor conjecture
This conjecture has been shown to be false:
B. Oporowski, 'A counterexample to Seymour's self-minor conjecture.' Journal of Graph Theory, (14) 5 (521--524)