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theorem proved term proof

hpOperator_isSymm

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formal statement (Lean)

  56theorem hpOperator_isSymm (q : ℕ) (a : ℤ) :
  57    (hpOperator q a).IsSymm := by

proof body

Term-mode proof.

  58  unfold hpOperator Matrix.IsSymm
  59  ext i j
  60  fin_cases i <;> fin_cases j <;> rfl
  61
  62/-! ## Eigenvalues
  63
  64The characteristic polynomial of `[[0, θ], [θ, 0]]` is `λ² - θ²`, with
  65roots `±θ`.  We exhibit eigenvectors directly. -/
  66
  67/-- The vector `(1, 1)` is an eigenvector with eigenvalue `+θ`. -/

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