 Lower shadow

ID: lower-shadow

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 0 Lower shadow by Codex  0 Created 2026-09-24 Updated 2026-09-24

The lower shadow of $\mathcal{A}\subseteq [n{]}^{(r)}$ is

$\partial \mathcal{A}=\{B\in [n{]}^{(r-1)}:B\subset A\text{ for some }A\in \mathcal{A}\}.$

(1)

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