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theorem proved term proof

deriv_coordRay_i

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formal statement (Lean)

 383theorem deriv_coordRay_i (x : Fin 4 → ℝ) (i : Fin 4) :
 384    deriv (fun t => (coordRay x i t) i) 0 = 1 := by

proof body

Term-mode proof.

 385  simp only [coordRay_apply, basisVec_self, mul_one]
 386  rw [deriv_const_add, deriv_id'']
 387

depends on (4)

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