The Best Mathematics Forums and Online Communities
A comprehensive guide to the best online communities for mathematics: forums, Q&A sites, chat servers, and social media groups where you can discuss mathematics, ask questions, and connect with other students and researchers.
Why Online Communities Matter
Mathematics can be an isolating pursuit. You spend hours alone with a problem, struggling to understand a proof, or trying to make sense of a new concept. Online mathematics communities provide something invaluable: other people who care about the same problems you do.
The best mathematics communities offer:
- Help when you are stuck — clear explanations from people who have been where you are
- Exposure to new ideas — discussions about topics outside your courses
- Motivation — seeing others work hard at mathematics keeps you going
- Connections — relationships that can lead to study partners, collaborators, and mentors
This guide covers the best mathematics communities online, from formal Q&A sites to informal chat servers.
Question-and-Answer Sites
Mathematics Stack Exchange (MSE)
MSE is the largest mathematics Q&A community on the internet. With millions of questions and answers, it covers every level from basic algebra to advanced graduate topics.
Strengths:
- Enormous archive of existing questions and answers
- MathJax support for beautiful mathematical notation
- Reputation system that incentivizes quality
- Well-moderated with clear community standards
Best for: Getting help with specific mathematical questions at any level. See our complete guide to Mathematics Stack Exchange for detailed advice.
MathOverflow (MO)
MathOverflow is the research-level counterpart to MSE. Questions here are expected to be at the graduate or professional research level.
Strengths:
- Active participation by professional mathematicians (including Fields Medalists)
- High-quality answers to research questions
- Valuable "big list" questions about references, open problems, and mathematical culture
Best for: Graduate students and researchers with questions that go beyond textbook material.
Tip: Even if you are not ready to post on MathOverflow, reading the discussions there is extremely educational. The "soft-question" tag contains fascinating discussions about mathematical culture, research practices, and career advice.
Quora Mathematics
Quora has an active mathematics section with answers from both professional mathematicians and enthusiastic amateurs.
Strengths:
- More conversational tone than Stack Exchange
- Good for "big picture" and motivational questions
- Some very knowledgeable contributors
Limitations: Less mathematical rigor than MSE, inconsistent quality, and Quora's interface is not designed for mathematical notation.
Discussion Forums
Art of Problem Solving (AoPS) Forums
artofproblemsolving.com/community
The AoPS forums are the premier community for mathematical problem-solving. Originally focused on competition mathematics, the community has grown to include discussions at all levels.
Key sections:
- High School Math — AMC, AIME, and USAMO problem discussions
- Olympiad Section — International olympiad problems and techniques
- College Math — Putnam problems and university-level topics
- Resource Area — Book recommendations, study plans, and career advice
Best for: Students passionate about problem-solving, from high school through undergraduate level.
Physics Forums — Mathematics Section
physicsforums.com/forums/mathematics.73
Despite the name, Physics Forums has an excellent mathematics section covering:
- Pure mathematics (algebra, analysis, topology)
- Applied mathematics
- Probability and statistics
- Mathematical physics
The community includes many PhD students and professors, and the moderation standards are high.
Reddit Mathematics Communities
Reddit hosts several active mathematics communities:
-
r/math (reddit.com/r/math) — The largest general mathematics community on Reddit. Discussions range from career questions to new research results. The "Simple Questions" thread is a good place for quick questions.
-
r/learnmath (reddit.com/r/learnmath) — Specifically for people learning mathematics at any level. Questions that might be too basic for r/math are welcome here.
-
r/mathbooks (reddit.com/r/mathbooks) — Discussions about mathematics textbooks, recommendations, and reviews.
Reddit tips: Use LaTeX notation in comments by writing $...inline...$ or $$...display...$ — several math subreddits have enabled MathJax rendering. When asking questions on r/math, read the subreddit rules first; many questions are better suited for r/learnmath or the Simple Questions thread.
Chat and Real-Time Communities
Discord Servers
Discord has become a popular platform for mathematics communities. Several large servers exist:
- Mathematics — One of the largest math Discord servers with channels organized by topic (algebra, analysis, topology, etc.)
- Math and Physics — Combines mathematics and physics discussions
- Homework Help — Focused on helping students with coursework
Search for "mathematics" on Discord's server discovery feature, or look for invitations posted on r/math and AoPS.
Strengths: Real-time conversation, voice channels for study sessions, and a more informal atmosphere than forums.
Matrix/Element Chat
Some open-source-oriented mathematics communities use Matrix (via the Element client) for communication. These tend to be smaller but more focused, often organized around specific topics like category theory or homotopy type theory.
Zulip
Zulip is used by several mathematical communities, including:
- Lean Prover community (leanprover.zulipchat.com) — The community around the Lean theorem prover, active at the intersection of mathematics and computer science
- Mathlib — Discussions about the Lean mathematical library
Collaborative Mathematics Platforms
Polymath Projects
The Polymath Project hosts collaborative efforts to solve mathematical problems through online teamwork. Founded by Timothy Gowers and Michael Nielsen, Polymath projects have successfully tackled several open problems.
While not always active, the Polymath blog and wiki contain fascinating records of how mathematical collaboration can work in an online setting.
MathForum (Legacy)
The original Math Forum at Drexel University was a pioneering online mathematics community. While it no longer operates independently, its archives contain valuable problem collections and discussions.
Social Media for Mathematics
Twitter/X and Mastodon
Many mathematicians are active on social media:
- Twitter/X Math Community — Follow the
#mathand#MathTwitterhashtags. Many prominent mathematicians share insights, paper recommendations, and mathematical observations. - Mastodon — The mathstodon.xyz instance is specifically for mathematics. It tends to have more substantive discussions than other platforms.
YouTube Comment Sections
On mathematics YouTube channels like 3Blue1Brown, Mathologer, and Michael Penn, the comment sections often contain valuable mathematical discussions, alternative proofs, and clarifications.
Academic Communities
Department Seminars and Colloquia
Do not overlook the offline community at your own institution. Attend:
- Departmental seminars — Even if you understand only 20% of a talk, exposure to research mathematics is valuable
- Graduate student seminars — Often more accessible than faculty seminars
- Problem-solving groups — Organize or join weekly problem sessions
- Colloquium talks — Broad survey talks designed for a general mathematical audience
Summer Schools and Conferences
Many summer schools and conferences welcome advanced undergraduates:
- MSRI/SLMath summer schools (msri.org) — Prestigious summer programs in various mathematical areas
- Park City Mathematics Institute (ias.edu/pcmi) — Summer program with lecture series at multiple levels
- Budapest Semesters in Mathematics (budapestsemesters.com) — A semester abroad focused on proof-based mathematics
Building your network: The connections you make in mathematical communities — online and offline — can be enormously valuable throughout your career. A professor you meet at a conference might become your PhD advisor. A student you help on MSE might become a collaborator years later.
How to Be a Good Community Member
1. Show Your Work
When asking for help, always show what you have tried. This demonstrates respect for the community's time and helps others give targeted advice.
2. Give Back
Answer questions when you can. Even if you are still learning, you can help someone who is a step behind you. Teaching others is one of the best ways to learn.
3. Be Respectful
Mathematics can be frustrating, and online communication lacks tone. Assume good faith, be patient with others, and remember that everyone is at a different point in their mathematical journey.
4. Cite Your Sources
When referencing a theorem, book, or paper, include a citation. This helps others learn and maintains intellectual honesty.
5. Be Specific
"I don't understand analysis" is not a useful question. "I don't understand why the proof of the Heine-Borel theorem requires the nested intervals property" is.
Summary Table
| Community | Type | Best For | Level |
|---|---|---|---|
| Math Stack Exchange | Q&A | Specific questions | All levels |
| MathOverflow | Q&A | Research questions | Graduate/research |
| AoPS Forums | Forum | Problem-solving | High school to undergraduate |
| r/math | Forum | Discussion, news | All levels |
| r/learnmath | Forum | Getting help | Beginner to intermediate |
| Physics Forums | Forum | Discussion, physics interface | All levels |
| Discord servers | Chat | Real-time discussion | All levels |
| Lean Zulip | Chat | Formalized math | Intermediate to advanced |
| Mathstodon | Social media | Mathematical community | All levels |
Final Thoughts
The internet has given us something remarkable: a global mathematics community that anyone can join. Whether you prefer the structured format of Stack Exchange, the real-time conversation of Discord, the problem-solving focus of AoPS, or the casual discussions on Reddit, there is a place for you.
The most important step is to participate. Start by reading and learning from existing discussions, then ask your first question, and eventually start answering others. The mathematics community is stronger when you are part of it.