Validity of coordinate square mask smallPairMask_1_3_7

Proved

D1Bound5.smallPairMask_1_3_7_valid

by tp · Oct 24, 2026 · Mathlib 0df444a (Lean v4.33.1)

diophantine-tuplesnumber-theory

The mask smallPairMask_1_3_7 accepts every square modulo 19 in the quadratic coordinate algebra with relation ω² = τω − ν, where τ = 1 and ν = 3. This includes the zero square.

Preamble

import Mathlib.Algebra.QuadraticAlgebra.Basic
import Mathlib.Data.Int.Sqrt
import Mathlib.Data.ZMod.Basic
import Mathlib.Tactic.Linarith
import Definitions.Def_D1Bound5_FastSquareTest_Definitions
import Definitions.Def_D1Bound5_SmallPairSieve_1_3_Definitions

Formal statement

section
namespace D1Bound5
set_option maxRecDepth 100000
set_option maxHeartbeats 0























theorem _root_.D1Bound5.smallPairMask_1_3_7_valid : CoordinateSquareMaskValid 1 3 18 smallPairMask_1_3_7 := by sorry
























































end D1Bound5
end

Source

D1Bound5/SmallPairSieve_1_3.lean, lines 43-45, SHA-256 de8037573b1c98178daf87e34451016cb0977dee496699893d9863d236ac805b. Project: https://github.com/tomislav-math/d1-bound5-lean

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