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Example: Gas Burner<br />
Requirement<br />
Design decisions<br />
ℓ ≥ 60 ⇒ 20 L ≤ ℓ<br />
( ⌈L ⌉ ⇒ ℓ ≤ 1)<br />
(( ⌈L ⌉ ⌢ ⌈¬L ⌉ ⌢ ⌈L ⌉) ⇒ ℓ ≥ 30)<br />
where ℓ denotes the length of the interval, and<br />
♦φ = true ⌢ φ ⌢ true “for some sub-interval: φ”<br />
φ = ¬♦¬φ “for all sub-intervals: φ”<br />
⌈P ⌉ = P = ℓ ∧ ℓ > 0 “P holds throughout a non-point interval”<br />
succinct formulation — no interval endpoints<br />
Tallinn, November 17- 21, Michael R. Hansen – p.8/29