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<strong>Pre</strong>suppositions and Heimian semantics<br />

• PPs as preconditions<br />

• Admittance operators, e.g. ∂<br />

• Acceptance and admittance<br />

• ∂ defined: ∂φ : “the pp that φ”<br />

(5) a. ψ pp φ iff, for every s, if s admits ψ then s accepts φ.<br />

b. s ⊕ ∂φ = s if s ✷ φ and is undefined otherwise.<br />

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