def
definition
def or abbrev
addNotes
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formal statement (Lean)
156def addNotes {α : Type} (notes : List String) (m : Measurement α) : Measurement α :=
proof body
Definition body.
157 { m with notes := m.notes ++ notes }
158
159end Measurement
160
161/-- An observable extracts a `Measurement α` from some state type `S`. -/