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def definition def or abbrev

add

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formal statement (Lean)

  29def add (φ₁ φ₂ : ScalarField) : ScalarField :=

proof body

Definition body.

  30  { ψ := fun x => φ₁.ψ x + φ₂.ψ x }
  31
  32/-- Scalar multiplication. -/

depends on (3)

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