coinitial subset

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Density (disambiguation) — Density and dense usually refer to a measure of how much of some entity is within a fixed amount of space. Types of density include: In physics, density of mass: Density, mass per volume Area density or surface density, mass over a (two… … Wikipedia
Cofinal (mathematics) — In mathematics, let A be a set and let ≤ be a binary relation on A. Then a subset B of A is said to be cofinal if it satisfies the following condition: For every a ∈ A, there exists some b ∈ B such that a ≤ b. This… … Wikipedia

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