Note determines closure ideal for endpoint wall, indicating its structural components and properties.
This note determines the scheme-theoretic closure of the endpoint wall on the ALA_LAL-chart for endpoint-compression word fibers. It proves that the closure ideal is exactly (BL−AL):AL∞=(aL)∩(KL−4),(B_L-A_L):A_L^∞=(a_L)∩( KL-4),(BL−AL):AL∞=(aL)∩(KL−4), so the closure is reduced, has precisely the terminal and continuant-residue components, and has no embedded components.
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Hiroyuki Shioiri (2026) studied this question.
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