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Fixed-width binary encoder recovers its numerator

Proved
ShiQMACenteredGap.fractionBits_numerator

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

amplificationbinary-encodingcenteringqmaquantum-complexity

For every j smaller than 2^k, decoding the k-bit fractional encoding of j returns exactly j.

Preamble
import Definitions.Def_ShiQMACenteredGapComputableCoin

set_option autoImplicit false
Formal statement
theorem ShiQMACenteredGap.fractionBits_numerator (k j : Nat) (hj : j < 2 ^ k) :
    binaryNumerator (fractionBits k j) = j := by
  sorry
Source
https://github.com/shiy1022/qma-amplification-lean/blob/c789401/proofs/AMPUNI-computable-centering.lean#L105-L123

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