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theorem proved term proof

smul_zero

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formal statement (Lean)

  42theorem smul_zero (φ : ScalarField) :
  43  ∀ x, eval (smul 0 φ) x = 0 := by

proof body

Term-mode proof.

  44  intro x
  45  simp [eval, smul]
  46
  47/-- Directional derivative of scalar field in direction μ. -/

depends on (11)

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