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Sang-il Oum

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Mastodon @sioum@mathstodon.xyz 📍 South Korea
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🔄 Data last refreshed 22 hours ago
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📣Sponsored postOne disclosed post (toot) with your link and message. $12→ 🧵Sponsored threadA multi-post explainer or story — the fediverse rewards depth over one-liners. $30→ 📦Product seeding / honest reviewSend me your product — I post a disclosed, honest take. Authenticity is the only ad this audience tolerates. $16→ 📌Pinned sponsored postA disclosed post pinned to the top of my profile for the month. $36/mo→ 🔗Profile link (bio field)Your link in one of my profile metadata fields for the month — native and low-key. $18/mo→ 🔁Boost packageI boost (repost) your account's toots through the month — distribution with zero content lift. $24/mo→ 🏛️Instance / community sponsorshipSponsor the server I run — a sponsor line in the About/rules and a welcome shout. A goodwill buy that keeps our community running. $30/mo→ 🤝Mutual boost collabWe boost each other across instances — a value swap between communities. Swap or paid→ 🎬UGC HireBranded content for your own channels & ads from $50→ 🎙️Podcast guest spotInvite Sang-il Oum onto your podcast (~45 min, remote) $25→ 📞1:1 ConsultPaid video call — advice, coaching or Q&A $75/hr→

Every booking is a normal escrow-protected deal.

Followers
172
Account age
7 yrs
🎁 Free analysisfor Sang-il Oum
🕵️Fake Followers CheckReal-audience % & bot risk→ 📊Engagement rateBenchmarked vs. peers→ 💰What they chargeFair sponsored-post price→

📊 Post engagement

Recent posts · likes + reposts
Jul 11latest
3
Avg engagement / post
2–6
Typical post (engagement)
1.7%
Engagement vs followers
70/100
Consistent reach
Nov 2018
On Mastodon since
Half of recent posts land between 2 and 6 likes + reposts (median 2) — a dependable floor a sponsored post can count on.

🔥 Top post: I have written an exposition of a proof of the cycle double cove · 7 likes + reposts

📊 Activity & format

Posting cadence
8 / week
Toots daily — consistently active for a campaign window.
Content mix
Mostly text
Recent: 12 text · 0 image · 0 video.
Follower / following
2×
Follows 88 back. A more reciprocal / networked account.

Recent posts

View on Mastodon ↗
🔥 Top post I have written an exposition of a proof of the cycle double cover conjecture announced by OpenAI in July 11, 2026, while preparing a talk at the Discrete Math Seminar at IBS given at July 16, 2026. Comments are welcome. https://sangil.dimag.kr/2026/cdc/ ★ 7
#New_accepted_paper *O-joung Kwon* and Xiaopan Lian, Group vertex-arboricity of group-labelled graphs, Discrete Math., accepted, 2026. https://arxiv.org/abs/2305.01472 Zichao Dong gave a talk on the maximum size of a set family in which, for each i≤k, every intersection of i members has a prescribed parity at the Discrete Math Seminar http://www.youtube.com/watch?v=0T5pmKTH8Vs https://dimag.ibs.re.kr/202… ★ 2 #New_arXiv_paper *Sang-il Oum*, A proof of the cycle double cover conjecture by OpenAI: An exposition, 2026. https://arxiv.org/abs/2607.16356 ★ 5 #New_accepted_paper Daniel Lokshtanov, Paweł Rzążewski, Saket Saurabh, *Roohani Sharma*, and Meirav Zehavi, Maximum Partial List H-Coloring on $P_5$-free graphs in polynomial time, J. Graph Theory, accepted, 2026. https://arxiv.org/abs/24… ★ 2 Sang-il Oum (엄상일) gave a talk at the Discrete Math Seminar on a recent proof of the cycle double cover conjecture by OpenAI http://www.youtube.com/watch?v=TH7huW27BHA https://dimag.ibs.re.kr/2026/cdc/ ★ 6 Yaobin Chen gave a talk on the maximum size of a subset in general position of a random subset of a finite-dimensional vector space over a finite field http://www.youtube.com/watch?v=SCls0AFRwjo https://dimag.ibs.re.kr/2026/yaobin-chen-sem… #New_accepted_conferrence_paper Dario Cavallaro, *Maximilian Gorsky*, Stephan Kreutzer, Dimitrios M. Thilikos, and Sebastian Wiederrecht, Optimal Bounds for the k-Disjoint Paths Problem, In the Proceedings of the 67th Annual Symposium on … ★ 1 2026 Workshop on Topological Combinatorics Successfully Held at GIST The 2026 Workshop on Topological Combinatorics was successfully held at Gwangju Institute of Science and Technology (GIST) from June 28 to July 11, 2026.... https://dimag… Welcome Yaobin Chen and Simón Piga, new members of IBS ECOPRO The IBS Discrete Mathematics Group welcomes Dr. Yaobin Chen and Dr. Simón Piga, new research fellows at the IBS Extremal Combinatorics and Probability Group, starting July 1, 20… Ting-Wei Chao gave a talk on a variation of the odd town problem at the Discrete Math Seminar http://www.youtube.com/watch?v=N576QJkJUyE https://dimag.ibs.re.kr/2026/ting-wei-chao-seminar-2/ OpenAI에서 이번에 해결한 50년 묵은 Cycle Double Cover 추측 증명을 오늘 읽어봤습니다. 학부 그래프이론 수업에서 강의하는 Jaeger의 nowhere-zero 8-flow 정리로 시작해서... 기발한 방식으로 각 edge에 두 개씩 값을 주는 방식을 잘 정의하더니 선형대… ★ 1

🐘 Community & instance

Home server
mathstodon.xyz
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
✅ Link-verified
Verified link
Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.
On Mastodon since
Nov 2018
An OG fediverse account from Mastodon's early years — a long, established presence.

💡 Facts

🗓️Joined Mastodon in 2018 — 7 years ago.
👁️Averages 3 views per post.
📤Posts about 8× per week.
📍Based in South Korea.

🕵️ Fake follower check

Estimated
75/100
Good Credibility score
92%
Real Real audience
Low Fake-follower risk
High Data confidence
  • Est. 92% real, active audience · Low fake-follower risk.
  • Engagement (~1.7% of followers engage each post) is around typical for Mastodon.
  • Verified account.
  • Established account (7+ years old).

Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.

About

수학자/그래프 이론 전공/기초과학연구원 이산수학그룹 CI😎 Mathematician / Graph Theory / CI of the IBS Discrete Mathematics Group

🔀 Audience overlap

Estimated

Estimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.

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Frequently asked questions

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How many followers does Sang-il Oum have?
Sang-il Oum has 172 followers on Mastodon.

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