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Coin code realizes the intended dyadic probability

Proved
ShiQMACenteredGap.encodeCoin_probability

by Goku · Oct 1, 2026 · Mathlib 0df444a (Lean v4.33.1)

amplificationbinary-encodingcenteringqmaquantum-complexity

For every j at most 2^k, the executable coin code has probability j/2^k, including the endpoint j=2^k represented by a constant-one code.

Preamble
import Definitions.Def_ShiQMACenteredGapComputableCoin
import Theorems.Thm_ShiQMACenteredGap_fractionBits_numerator

set_option autoImplicit false
Formal statement
theorem ShiQMACenteredGap.encodeCoin_probability (k j : Nat) (hj : j ≤ 2 ^ k) :
    (encodeCoin k j).probability = (j : ℝ) / (2 : ℝ) ^ k := by
  sorry
Source
https://github.com/shiy1022/qma-amplification-lean/blob/c789401/proofs/AMPUNI-computable-centering.lean#L125-L144

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