✓ Proved
Time reversal acts as the shadow
On the principal series Δ = 1 + iλ, complex conjugation (which is what time reversal does to these labels) is exactly the shadow map Δ ↦ 2 − Δ.
shadow_equals_time_reversal
File: RiemannHypothesis/ShadowSymmetry.lean
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✓ Proved
The half-flip
Reversing time twice on a spin-½ particle flips its sign: T²ψ = −ψ.
wignerT_wignerT
File: StandardModel/HalfFlipProposition.lean
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✓ Proved
Time reversal is not completely positive
One direction of Choi's criterion. Combined with the SWAP matrix's explicit negative direction, this shows why the transpose, and hence time reversal, is positive but not completely positive.
not_completelyPositive_of_not_posSemidef_choiMatrix
File: QuantumInformation/ChoiMatrix.lean
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✓ Proved
Exactly three doublings
Starting from the real numbers, the doubling construction gives the complex numbers, the quaternions and the octonions, and then stops being a division algebra. That is exactly three proper steps.
exactly_three_doublings
File: StandardModel/ThreeGenerations.lean
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Open
…and so three generations of matter?
That this forces the three generations of particles seen in nature is a physical claim. It depends on an open link in the framework. The count above is proved; the bridge to particles is not.
open_anomaly_cancellation_forces_three_generations
File: StandardModel/ThreeGenerations.lean
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✓ Proved
The golden ratio, from the modular group
φ² is a root of the characteristic polynomial of the smallest hyperbolic element of PSL₂(ℤ). This is proved, not asserted.
A_charpoly_root_goldSq
File: NumberTheory/GoldenRatioHyperbolicSector.lean
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Open
The Yang–Mills mass gap
A Millennium Prize problem, listed so it cannot be mistaken for anything else. The Casimir and Sugawara arithmetic in the same file is proved. This statement is not, and it is open mathematics everywhere.
open_yang_mills_mass_gap
File: YangMills/MassGap.lean
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