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birch_swinnerton_dyer

Proved

by tianyipeng · Jun 1, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

algebraic-geometryanalysisellipticcurvesl-functionsmillennium-prizemillenniumprizenumber-theorynumbertheoryopen-problemopenproblem

⚠️ Retired — this formal statement is not a formalization of the Birch–Swinnerton-Dyer conjecture.

Its Proved status is an artifact of the encoding and must not be read as progress on BSD. Do not import it or use it as a dependency.

Birch–Swinnerton-Dyer conjecture (Millennium Prize): the rank of an elliptic curve over Q\mathbb{Q}Q equals the order of vanishing of its LLL-function at s=1s = 1s=1. One of the deepest unsolved problems in number theory.

Why this node was retired

After the hypotheses on aaa, bbb and a set pts of rational points, the goal of the posted statement is

∃ rank∈N, rank=0 ∧ (∃ s∈C, s=1∧True).\exists\,\text{rank} \in \mathbb{N},\ \text{rank} = 0 \ \wedge\ \bigl(\exists\, s \in \mathbb{C},\ s = 1 \wedge \text{True}\bigr).∃rank∈N, rank=0 ∧ (∃s∈C, s=1∧True).

This is a closed proposition that asserts only that the natural number 000 and the complex number 111 exist. It has no logical connection to the hypotheses: pts and hcurve are never mentioned in the conclusion, and the curve y2=x3+ax+by^2 = x^3 + ax + by2=x3+ax+b plays no role. Consequently the whole statement is discharged by the term ⟨0, rfl, 1, rfl, trivial⟩, which is exactly what the accepted submission does.

None of the content of BSD is present:

  1. The Mordell–Weil group E(Q)E(\mathbb{Q})E(Q) and its rank do not occur — rank is an unconstrained existential witness, immediately pinned to 000 by the statement itself rather than defined from the curve.
  2. The Hasse–Weil LLL-function L(E,s)L(E, s)L(E,s) does not occur — s is likewise a free existential witness pinned to 111.
  3. The actual claim, ord⁡s=1L(E,s)=rank⁡E(Q)\operatorname{ord}_{s=1} L(E,s) = \operatorname{rank} E(\mathbb{Q})ords=1​L(E,s)=rankE(Q), is nowhere stated; True stands in its place.

The submitter proved the statement that was posted, and the proof is valid for that statement — the defect is in the problem statement, not in the submission.

What a faithful statement would require

A usable formalization needs, at minimum: the group E(Q)E(\mathbb{Q})E(Q) of rational points with its structure as a finitely generated abelian group and the resulting rank; the LLL-function L(E,s)L(E,s)L(E,s) together with its analytic continuation to a neighbourhood of s=1s = 1s=1; and the assertion that the order of vanishing of that continuation at s=1s = 1s=1 equals the rank. Each ingredient is a substantial formalization effort on its own, and none of them is approximated by the placeholder above.

No corrected replacement node exists yet. The Millennium Prize problem remains open.

Preamble
import Mathlib
Formal statement
import Mathlib

theorem birch_swinnerton_dyer (a b : ℤ) (hdisc : 4 * a ^ 3 + 27 * b ^ 2 ≠ 0)
    (pts : Set (ℚ × ℚ)) (hcurve : ∀ p ∈ pts, (p.2)^2 = (p.1)^3 + (a : ℚ) * p.1 + b) :
    ∃ (rank : ℕ), rank = 0 ∧
      (∃ s : ℂ, s = 1 ∧ True) := by
  sorry
Source
https://en.wikipedia.org/wiki/Birch_and_Swinnerton-Dyer_conjecture

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