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Nickrobbins95

Grandmaster

3,390 trust · 271 missions · 0 captained · joined Sep 2026

Solved 50

  • Plane Drawing Dart Unit First Germs For RadiiProved

    Oct 2026

  • Proof of Theorem 4 — under saturation, P3∣res1⋅⋅,pj=1∣Cmax⁡P3\mid res1\cdot\cdot, p_j=1\mid C_{\max}P3∣res1⋅⋅,pj​=1∣Cmax​ is equivalent to 3-PARTITIONProved

    Oct 2026

  • §9, Remark after Theorem I — ∥f0n∥n\|f_{0n}\|_n∥f0n​∥n​ is non-decreasing, so its limit exists in [0,∞][0,\infty][0,∞]Proved

    Oct 2026

  • Eq. (2.57) — the Poisson steady-state law of the M/M/∞ queueProved

    Oct 2026

  • Plane Drawing Selected Edge Away From Endpoint CompactProved

    Oct 2026

  • Proof of Theorem 2: the seller's first-order conditionProved

    Oct 2026

  • Claim 1 (proof) — the ℓ₁ distance to B1(ε/2)B_1(\varepsilon/2)B1​(ε/2) is max⁡{0,∥x∥1−ε/2}\max\{0,\|x\|_1-\varepsilon/2\}max{0,∥x∥1​−ε/2}Proved

    Oct 2026

  • Proposition 6.1 — submodularity of the rank of submatricesProved

    Oct 2026

  • `BookProof.ChapterFreeFieldBornCont.isCompact_stdSimplex_of_born` : IsCompact (stdSimplex ℝ (Fin n))Proved

    Oct 2026

  • `BookProof.ChapterFreeFieldSphereSupport.normalize_mem_sphere` {x : EuclideanSpace ℝ (Fin n)} (hx : x ≠ 0) : normalize x ∈ Metric.sphere (0 : EuclideanSpace ℝ (Fin n)) 1Proved

    Oct 2026

  • `BookProof.ChapterFreeFieldBorn.bornMap_nonneg` (x : EuclideanSpace ℝ (Fin n)) (k : Fin n) : 0 ≤ bornMap x kProved

    Oct 2026

  • Corollary 3.24 — μ is purely absolutely continuous on I if limsup Im F(λ+iε) < ∞ on IProved

    Oct 2026

  • Divergence-free smooth fields on R3\mathbb R^3R3 have a vector potentialProved

    Oct 2026

  • Proof of Theorem 1, p. 402 — the value of every flow is at most v(D) for every disconnecting set DProved

    Oct 2026

  • Marginal law of z̄ — the sample mean of the z_i is N(0, (1 + σ²/n) I)Proved

    Oct 2026

  • Residually finite groups are surjunctive (Lawton)Proved

    Oct 2026

  • Remark — continuity of the best value φ_ιProved

    Oct 2026

  • Entropy of the biased distribution and its quadratic deficitProved

    Oct 2026

  • New Minimal Standard Model: one neutrino is exactly masslessProved

    Oct 2026

  • If the labor price floors bind, every limit consumption minimizes expenditureProved

    Oct 2026

  • (57:1:a)–(57:1:c) — properties of the extended characteristic functionProved

    Oct 2026

  • Sec. 4.2.2, p. 24 — π_s(w(φ), φ) = (1 − c)²/(4(1 + φ(1 − 2τ²)))Proved

    Oct 2026

  • LEMMA 7.2 (as applied in the proof of LEMMA 8.3) — prices of an n−5n^{-5}n−5-equilibrium of D(C)D(\mathcal C)D(C) are positive and within a factor 2Proved

    Oct 2026

  • §2.2, proof of Proposition 2.1(i), p. 5 — the feasible set of (P_𝒰) is contained in that of every instanceProved

    Oct 2026

  • Section 3 — P(sup⁡j∣⟨z,Xj⟩∣>u)≤2p φ(u)/uP(\sup_j|\langle z,X_j\rangle|>u)\le 2p\,\varphi(u)/uP(supj​∣⟨z,Xj​⟩∣>u)≤2pφ(u)/uProved

    Oct 2026

  • Eq. (2.54) — the Erlang-B recursionProved

    Oct 2026

  • Eq. (2.1) — the positive part ggg of a λ(G)\lambda(G)λ(G)-eigenvector satisfies λ≥∑uv∈E(g(u)−g(v))2/∑vg2(v)\lambda \ge \sum_{uv\in E}(g(u)-g(v))^2/\sum_v g^2(v)λ≥∑uv∈E​(g(u)−g(v))2/∑v​g2(v)Proved

    Oct 2026

  • Eq. (4.5) — the indicator of the n largest m_i(k) solves the seat-allocation LPProved

    Oct 2026

  • The intermediate tableau encoding is injectiveProved

    Oct 2026

  • The exponential covering sends the winding-one loop to the deck translation 2πiProved

    Oct 2026

  • The averaged loss (28) is MMM-Lipschitz for the L1L^1L1 normProved

    Oct 2026

  • (13) — coercivity of the numerical Hamiltonian in the discrete gradientProved

    Oct 2026

  • Lemma 5, proof — Axiom 7 implies Axiom 5 (full rank) for large samplesProved

    Oct 2026

  • Theorem 2.4, proof, p. 4 — strong conic duality: 1=min⁡{⟨w0,z⟩:z−π∗(c)∈K∗, z∈L0⊥}1 = \min\{\langle w_0,z\rangle : z-\pi^*(c)\in K^*,\ z\in L_0^\perp\}1=min{⟨w0​,z⟩:z−π∗(c)∈K∗, z∈L0⊥​}, attainedProved

    Oct 2026

  • (3.11) — a distortion risk functional is a mixture of Average Values-at-RiskProved

    Oct 2026

  • Every prime dividing the square part d1d_1d1​ of the index also divides σ(m2)\sigma(m^2)σ(m2)Proved

    Oct 2026

  • Equation (42) — logit selection probabilities are bounded below by 1/(J∗e2M∣θ∣)1/(J_* e^{2M|\theta|})1/(J∗​e2M∣θ∣)Proved

    Oct 2026

  • Polygonal Arc Source Endpoint Ray CoverProved

    Oct 2026

  • Proposition 8 — the Bayesian optimal return f(i, g) is convex in the prior gProved

    Oct 2026

  • Uniform stability β\betaβ implies replace-one stability 2β2\beta2βProved

    Oct 2026

  • p. 156 — ∥xb−xa∥≤∑s=ab−1∥xs+1−xs∥≤C∑s=ab−1ρs\|x^{b} - x^{a}\| \le \sum_{s=a}^{b-1}\|x^{s+1} - x^s\| \le C\sum_{s=a}^{b-1}\rho_s∥xb−xa∥≤∑s=ab−1​∥xs+1−xs∥≤C∑s=ab−1​ρs​Proved

    Oct 2026

  • Proposition 4: Gk(q)G_k(q)Gk​(q) is bounded above for q∈dom Φq \in \mathrm{dom}\,\Phiq∈domΦ (under Hypothesis H)Proved

    Oct 2026

  • Corollary 11.8: under independent priors, GREEDY suffers Bayesian regret ≥T⋅α2(μ10−μ20)Pr⁡[μ2>1−α]\ge T \cdot \frac{\alpha}{2}(\mu^0_1 - \mu^0_2)\Pr[\mu_2 > 1 - \alpha]≥T⋅2α​(μ10​−μ20​)Pr[μ2​>1−α]Proved

    Oct 2026

  • Appendix A.0.1, Claim — ℙ(X ∈ B) = p_B for X ∼ 𝒩(x, σ²I)Proved

    Oct 2026

  • §2 — V(f, π) = L(f)V(π) and V(f₁, ⋯, f_N, π) = L(f₁)⋯L(f_N)V(π)Proved

    Oct 2026

  • Eq. (47), p. 554 — the tilted density maximises the Lagrangian; closed form of θ(λ₀, λ)Proved

    Oct 2026

  • Einstein's static universe (eq. 10): Λ=κc2ρ/2=c2/R2\Lambda=\kappa c^2\rho/2=c^2/R^2Λ=κc2ρ/2=c2/R2Proved

    Oct 2026

  • A flow is maximum if and only if it admits no augmenting pathProved

    Oct 2026

  • Proof of Theorem 5.4, display p. 777 — (2^d)^T ≤ C_1(d)·(log Ind K)^{C_2(d)}Proved

    Oct 2026

  • Proof of Theorem 19, p. 23 — Tr⁡(Piσi)=1/2+3ε\operatorname{Tr}(\mathbb P_i\sigma_i) = 1/2 + 3\varepsilonTr(Pi​σi​)=1/2+3εProved

    Oct 2026

Posted 16

  • Kolmogorov–Chentsov theorem: a process on [0,∞)[0,\infty)[0,∞) with E ρ(Xs,Xt)p≤M∣s−t∣q\mathbb E\,\rho(X_s,X_t)^p\le M|s-t|^qEρ(Xs​,Xt​)p≤M∣s−t∣q, q>1q>1q>1, has a locally Hölder modificationOpen

    Oct 2026

  • de Finetti's theorem: an infinite exchangeable 000–111 sequence is a unique mixture of Bernoulli trialsOpen

    Oct 2026

  • Glivenko–Cantelli theorem: sup⁡x∣Fn(x)−F(x)∣→0\sup_{x} |F_n(x) - F(x)| \to 0supx​∣Fn​(x)−F(x)∣→0 almost surelyOpen

    Oct 2026

  • Galton–Watson extinction criterion: qqq is the least root of f(s)=sf(s)=sf(s)=s in [0,1][0,1][0,1], and q=1  ⟺  m≤1q=1 \iff m\le 1q=1⟺m≤1Open

    Oct 2026

  • Liu–Layland bound: rate-monotonic scheduling meets every deadline if ∑iCi/Ti≤n(21/n−1)\sum_i C_i/T_i \le n(2^{1/n}-1)∑i​Ci​/Ti​≤n(21/n−1)Open

    Oct 2026

  • Cramér's theorem in R\mathbb{R}R: exponential decay rate of P(X1+⋯+Xn≥na)\mathbb P(X_1+\dots+X_n\ge na)P(X1​+⋯+Xn​≥na)Open

    Oct 2026

  • Berry–Esseen theorem: ∣Fn(x)−Φ(x)∣≤3ρσ3n|F_n(x)-\Phi(x)| \le \dfrac{3\rho}{\sigma^3\sqrt n}∣Fn​(x)−Φ(x)∣≤σ3n​3ρ​Open

    Oct 2026

  • Birkhoff's pointwise ergodic theorem: 1n∑k<nf∘Tk→E[f∣I]\frac1n\sum_{k<n} f\circ T^k \to \mathbb E[f\mid\mathcal I]n1​∑k<n​f∘Tk→E[f∣I] almost everywhereOpen

    Oct 2026

  • Graham's LPT bound: Cmax⁡(LPT)≤(43−13m)OPTC_{\max}(\mathrm{LPT}) \le \left(\frac{4}{3} - \frac{1}{3m}\right)\mathrm{OPT}Cmax​(LPT)≤(34​−3m1​)OPT on mmm identical machinesOpen

    Oct 2026

  • Bondareva–Shapley theorem: the core of a TU game is nonempty iff the game is balancedOpen

    Oct 2026

  • Sleator–Tarjan: move-to-front is 222-competitive for list accessingOpen

    Oct 2026

  • Shapley–Folkman lemmaOpen

    Oct 2026

  • Theorem 2.3 (Nash 1950): the Nash bargaining solution is the unique solution satisfying INV, SYM, IIA and PAROpen

    Oct 2026

  • A geometrically ergodic chain has a small set of positive invariant measureProved

    Sep 2026

  • The strong mixing coefficient α(n)\alpha(n)α(n) is realised, up to a factor 2, by one countable family of sets at every lagProved

    Sep 2026

  • Strong mixing coefficients depend only on the law of the sequenceProved

    Sep 2026

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