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)
Lean names referenced from this declaration's body.