Source-pinned research

Research proof index

Search theorem names, mathematical ideas, modules, topics, projects, and role-labelled researchers. Open a result for its complete indexed Lean declaration and source record.

This index contains 187 research declarations. Search 10,000 more complete Mathlib declarations.

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Project-declaredLean 4.31.0

Root Multiplicity ge of shift zero

GuruswamiSudan.rootMultiplicity_ge_of_shift_zero

Plain-language statement

If the shifted polynomial has no non-zero coefficients of total degree less than m, then the root multiplicity is at least m.

cryptographyproof systemscoding theory

Source project: ArkLib

Person-level attribution pending.

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Project-declaredLean 4.31.0

Root Multiplicity le of coeff ne zero

GuruswamiSudan.rootMultiplicity_le_of_coeff_ne_zero

Plain-language statement

If the (s, t)-coefficient of shift Q x y is non-zero, then the root multiplicity of Q at (x, y) is at most s + t.

cryptographyproof systemscoding theory

Source project: ArkLib

Person-level attribution pending.

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Project-declaredLean 4.31.0

Roots le degree of deg lt roots

GuruswamiSudan.roots_le_degree_of_deg_lt_roots

Plain-language statement

If a polynomial R has roots at points indexed by A with multiplicity at least m, and its degree is strictly less than m * |A|, then R must be the zero polynomial.

cryptographyproof systemscoding theory

Source project: ArkLib

Person-level attribution pending.

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Project-declaredLean 4.31.0

Sufficient multiplicity bound

GuruswamiSudan.sufficient_multiplicity_bound

Plain-language statement

The degree bound is strictly less than m times the number of agreement points, provided the distance is within the Johnson radius.

cryptographyproof systemscoding theory

Source project: ArkLib

Person-level attribution pending.

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Project-declaredLean 4.31.0

To Polynomial degree le

GuruswamiSudan.toPolynomial_degree_le

Plain-language statement

The polynomial corresponding to a codeword has degree at most k-1.

cryptographyproof systemscoding theory

Source project: ArkLib

Person-level attribution pending.

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Project-declaredLean 4.31.0

H₂ imag axis pos

H₂_imag_axis_pos

Plain-language statement

H₂(it) > 0 for all t > 0. Blueprint: Lemma 6.43 - H₂ is positive on the imaginary axis. Proof strategy: Each term exp(-π(n+1/2)²t) > 0, so Θ₂(it) > 0, hence H₂ = Θ₂^4 > 0.

sphere packingFourier analysismodular forms

Source project: Sphere Packing in Dimension 8

Person-level attribution pending.

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