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Theorem startorfin-def

⊦ startorfin(p, P0) ↔ (∃ p0. p0 ∈ P0 ∧ (p0.first = p.first ∧ p.last ≤ p0.last ∨ p0.first ≤ p.first ∧ p0.last = p.last))

Type: An axiom
Validity: The proof is valid.
Features:
Comment: each new interval is either the start or the end of an old interval
Used by: NEWPARTS-theorem, startorfin-reset,
Used by units in proved state:
Proof exists?: No