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theorem proved term proof

kernel_symm

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formal statement (Lean)

  59theorem kernel_symm {K : Type*} (I : PrimitiveInterface K) {x y : K}
  60    (h : I.kernel x y) : I.kernel y x := h.symm

proof body

Term-mode proof.

  61
  62/-- The observer kernel is transitive. -/

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