arXiv subjects

Chunlin You

Publications and source records attributed to Chunlin You.

8 recordsLinked to original sources

arXiv2026

The Ramsey threshold for trees versus odd cycles

A longstanding fundamental problem of Burr, Erd\H{o}s, Faudree, Rousseau and Schelp (\emph{Trans. Amer. Math. Soc.}, 1982) is to determine the exact value of the least integer $f(m)$, for odd $m\ge3$, such that every tree $T_n$ on $n\ge f(m)$ vertices satisfies $R(T_n,C_m)=2n-1$. We settle this problem for all sufficiently large odd $m$. Indeed, we establish $$f(m)=\left\lceil \frac{2m-1}{3} \right\rceil$$ for all such $m$, where the lower bound follows from a result by Faudree, Lawrence, Parsons and Schelp. This also confirms a conjecture of Huang, Zhang and Chen for all such $m$.

math.CO↗

arXiv2026

A Momentum-Based Variance-Reduced Algorithm for Federated Multiobjective Optimization

Federated learning has traditionally been formulated as a single-objective optimization problem, primarily focused on maximizing model utility. In real-world applications, however, machine learning models often need to optimize multiple and potentially conflicting objectives simultaneously. This motivates federated multiobjective optimization (FMOO), which provides a natural framework for jointly handling multiple task-specific objectives in federated learning. In this paper, we propose a momentum-based variance-reduced algorithm for federated multiobjective optimization. The method incorporates a momentum-driven gradient estimator into the local updates to reduce the variance of stochastic updates, leading to an improved convergence rate. We establish theoretical guarantees showing that the expected Pareto stationarity measure of a randomly selected output iterate decays at a rate of $\mathcal{O}(T^{-2/3})$, improving upon the $\mathcal{O}(T^{-1/2})$ rates established for existing methods such as FSMGDA and FedCMOO. Numerical experiments on federated multiobjective optimization benchmarks demonstrate the effectiveness and competitive performance of the proposed algorithm.

cs.LG↗

arXiv2026

Towards a conjecture on degree conditions for Ramsey goodness of paths

Recently, Arag\~{a}o, Marciano, and Mendon\c{c}a [\emph{European J. Combin.}, 2025] conjectured that for any graph $G$ on $n$ vertices satisfying $(r-1)(t-1)k < n \le (r-1)(t-1)(k+1)$, the minimum degree condition $\delta(G) \ge n - \left\lceil \frac{k}{k+1} \left\lceil \frac{n}{r-1} \right\rceil \right\rceil$ guarantees that $G \rightarrow (K_r, P_t)$. In this paper, we prove their conjecture for the regime $k \ge t-3$. Because the parameter $k$ scales linearly with the host graph order $n$, our result establishes the asymptotic truth of the conjecture.

math.CO↗

arXiv2022

Ramsey numbers of large even cycles and fans

For graphs $F$ and $H$, the Ramsey number $R(F, H)$ is the smallest positive integer $N$ such that any red/blue edge coloring of $K_N$ contains either a red $F$ or a blue $H$. Let $C_n$ be a cycle of length $n$ and $F_n$ be a fan consisting of $n$ triangles all sharing a common vertex. In this paper, we prove that for all sufficiently large $n$, \[ R(C_{2\lfloor an\rfloor}, F_n)= \left\{ \begin{array}{ll} (2+2a+o(1))n & \textrm{if $1/2\leq a< 1$,}\\ (4a+o(1))n & \textrm{if $ a\geq 1$.} \end{array} \right. \]

math.CO↗

arXiv2022

Three-color Ramsey number of an odd cycle versus bipartite graphs with small bandwidth

A graph $\mathcal{H}=(W,E_\mathcal{H})$ is said to have {\em bandwidth} at most $b$ if there exists a labeling of $W$ as $w_1,w_2,\dots,w_n$ such that $|i-j|\leq b$ for every edge $w_iw_j\in E_\mathcal{H}$. We say that $\mathcal{H}$ is a {\em balanced $(β,Δ)$-graph} if it is a bipartite graph with bandwidth at most $β|W|$ and maximum degree at most $Δ$, and it also has a proper 2-coloring $χ:W\rightarrow[2]$ such that $||χ^{-1}(1)|-|χ^{-1}(2)||\leqβ|χ^{-1}(2)|$. In this paper, we prove that for every $γ>0$ and every natural number $Δ$, there exists a constant $β>0$ such that for every balanced $(β,Δ)$-graph $\mathcal{H}$ on $n$ vertices we have $$R(\mathcal{H}, \mathcal{H}, C_n) \leq (3+γ)n$$ for all sufficiently large odd $n$. The upper bound is sharp for several classes of graphs. Let $θ_{n,t}$ be the graph consisting of $t$ internally disjoint paths of length $n$ all sharing the same endpoints. As a corollary, for each fixed $t\geq 1$, $R(θ_{n, t},θ_{n, t}, C_{nt+λ})=(3t+o(1))n,$ where $λ=0$ if $nt$ is odd and $λ=1$ if $nt$ is even. In particular, we have $R(C_{2n},C_{2n}, C_{2n+1})=(6+o(1))n$, which is a special case of a result of Figaj and Łuczak (2018).

math.CO↗

arXiv2021

Ramsey numbers of large books

A book $B_n$ is a graph which consists of $n$ triangles sharing a common edge. In 1978, Rousseau and Sheehan conjectured that the Ramsey number satisfies $r(B_m,B_n)\le 2(m+n)+c$ for some constant $c>0$. In this paper, we obtain that $r(B_m, B_n)\le 2(m+n)+o(n)$ for all $m\le n$ and $n$ large, which confirms the conjecture of Rousseau and Sheehan asymptotically. As a corollary, our result implies that a related conjecture of Faudree, Rousseau and Sheehan (1982) on strongly regular graph holds asymptotically.

math.CO↗

arXiv2019

A note on the size Ramsey number of powers of paths

Let $r\geq3$ be an integer such that $r-2$ is a prime power and let $H$ be a connected graph on $n$ vertices with average degree at least $d$ and $α(H)\leqβn$, where $0<β<1$ is a constant. We prove that the size Ramsey number \[ \hat{R}({H};r) > \frac{nd}{2}{(r - 2)^2} - C\sqrt n \] for all sufficiently large $n$, where $C$ is a constant depending only on $r$ and $d$. In particular, for integers $k\ge1$, and $r\ge3$ such that $r-2$ is a prime power, we have that there exists a constant $C$ depending only on $r$ and $d$ such that $\hat{R}(P_{n}^{k}; r)> kn{(r - 2)^2}-C\sqrt n -\frac{{({k^2} + k)}}{2}{(r - 2)^2}$ for all sufficiently large $n$, where $P_{n}^{k}$ is the $kth$ power of $P_n$. We also prove that $\hat{R}(P_n,P_n,P_n)<764.1n$ for sufficiently large $n$. This result improves some results of Dudek and Prałat (\emph{SIAM J. Discrete Math.}, 31 (2017), 2079--2092 and \emph{Electron. J. Combin.}, 25 (2018), no.3, # P3.35).

math.CO↗

arXiv2018

Cycle Ramsey numbers for random graphs

Let $C_{n}$ be a cycle of length $n$. As an application of Szemerédi's regularity lemma, Łuczak ($R(C_n,C_n,C_n)\leq (4+o(1))n$, J. Combin. Theory Ser. B, 75 (1999), 174--187) in fact established that $K_{(8+o(1))n}\to(C_{2n+1},C_{2n+1},C_{2n+1})$. In this paper, we strengthen several results involving cycles. Let $\mathcal{G}(n,p)$ be the random graph. We prove that for fixed $0 0$, there exists an integer $n_0$ such that for all integer $n_3>n_0$, we have a.a.s. that \begin{align*} \mathcal{G}((8+δ)n_1,p) \to (C_{2n_1+1},C_{2n_2+1},C_{2n_3+1}). \end{align*} Moreover, we prove that for fixed $0 0$ with same order, i.e. $n_2=Θ(n_1)$ and $n_3=Θ(n_1)$, we have a.a.s. that \begin{align*} \mathcal{G}(2n_1+n_2+n_3+o(1)n_1,p) \to (C_{2n_1},C_{2n_2},C_{2n_3}). \end{align*} Similar results for the two color case are also obtained.

math.CO↗