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theorem proved term proof

j_dalembert

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formal statement (Lean)

 125theorem j_dalembert {x y : ℝ} (hx : 0 < x) (hy : 0 < y) :
 126    Cost.Jcost (x * y) + Cost.Jcost (x / y) =
 127    2 * Cost.Jcost x + 2 * Cost.Jcost y + 2 * Cost.Jcost x * Cost.Jcost y :=

proof body

Term-mode proof.

 128  Cost.dalembert_identity hx hy
 129
 130/-- J-cost submultiplicativity: the cost of a composite transaction
 131    is bounded by the costs of its factors. -/

depends on (13)

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