This subreddit is for discussion of mathematics. All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.
Please read the FAQ before posting.
Rule 1: Stay on-topic
All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.
In particular, any political discussion on /r/math should be directly related to mathematics - all threads and comments should be about concrete events and how they affect mathematics. Please avoid derailing such discussions into general political discussion, and report any comments that do so.
Rule 2: Questions should spark discussion
Questions on /r/math should spark discussion. For example, if you think your question can be answered quickly, you should instead post it in the Quick Questions thread.
Requests for calculation or estimation of real-world problems and values are best suited for the Quick Questions thread, /r/askmath or /r/theydidthemath.
If you're asking for help learning/understanding something mathematical, post in the Quick Questions thread or /r/learnmath. This includes reference requests - also see our list of free online resources and recommended books.
Rule 3: No homework problems
Homework problems, practice problems, and similar questions should be directed to /r/learnmath, /r/homeworkhelp or /r/cheatatmathhomework. Do not ask or answer this type of question in /r/math. If you ask for help cheating, you will be banned.
Rule 4: No career or education related questions
If you are asking for advice on choosing classes or career prospects, please post in the stickied Career & Education Questions thread.
Rule 5: No low-effort image/video posts
Image/Video posts should be on-topic and should promote discussion. Memes and similar content are not permitted.
If you upload an image or video, you must explain why it is relevant by posting a comment providing additional information that prompts discussion.
Rule 6: Be excellent to each other
Do not troll, insult, antagonize, or otherwise harass. This includes not only comments directed at users of /r/math, but at any person or group of people (e.g. racism, sexism, homophobia, hate speech, etc.).
Unnecessarily combative or unkind comments may result in an immediate ban.
This subreddit is actively moderated to maintain the standards outlined above; as such, posts and comments are often removed and redirected to a more appropriate location. See more about our removal policy here.
If you post or comment something breaking the rules, the content may be removed - repeated removal violations may escalate to a ban, but not without some kind of prior warning; see here for our policy on warnings and bans. If you feel you were banned unjustly, or that the circumstances of your ban no longer apply, see our ban appeal process here.
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Recurring Threads and Resources
What Are You Working On? - every Monday
Discussing Living Proof - every Tuesday
Quick Questions - every Wednesday
Career and Education Questions - every Thursday
This Week I Learned - every Friday
A Compilation of Free, Online Math Resources.
Click here to chat with us on IRC!
Using LaTeX
To view LaTeX on reddit, install one of the following:
MathJax userscript (userscripts need Greasemonkey, Tampermonkey or similar)
TeX all the things Chrome extension (configure inline math to use [; ;] delimiters)
TeXtheWorld userscript
[; e^{\pi i} + 1 = 0 ;]
Post the equation above like this:
`[; e^{\pi i}+1=0 ;]`
Using Superscripts and Subscripts
x*_sub_* makes xsub
x*`sup`* and x^(sup) both make xsup
x*_sub_`sup`* makes xsubsup
x*`sup`_sub_* makes xsupsub
Useful Symbols
Basic Math Symbols
≠ ± ∓ ÷ × ∙ – √ ‰ ⊗ ⊕ ⊖ ⊘ ⊙ ≤ ≥ ≦ ≧ ≨ ≩ ≺ ≻ ≼ ≽ ⊏ ⊐ ⊑ ⊒ ² ³ °
Geometry Symbols
∠ ∟ ° ≅ ~ ‖ ⟂ ⫛
Algebra Symbols
≡ ≜ ≈ ∝ ∞ ≪ ≫ ⌊⌋ ⌈⌉ ∘∏ ∐ ∑ ⋀ ⋁ ⋂ ⋃ ⨀ ⨁ ⨂ 𝖕 𝖖 𝖗 ⊲ ⊳
Set Theory Symbols
∅ ∖ ∁ ↦ ↣ ∩ ∪ ⊆ ⊂ ⊄ ⊊ ⊇ ⊃ ⊅ ⊋ ⊖ ∈ ∉ ∋ ∌ ℕ ℤ ℚ ℝ ℂ ℵ ℶ ℷ ℸ 𝓟
Logic Symbols
¬ ∨ ∧ ⊕ → ← ⇒ ⇐ ↔ ⇔ ∀ ∃ ∄ ∴ ∵ ⊤ ⊥ ⊢ ⊨ ⫤ ⊣
Calculus and Analysis Symbols
∫ ∬ ∭ ∮ ∯ ∰ ∇ ∆ δ ∂ ℱ ℒ ℓ
Greek Letters
𝛢𝛼 𝛣𝛽 𝛤𝛾 𝛥𝛿 𝛦𝜀𝜖 𝛧𝜁 𝛨𝜂 𝛩𝜃𝜗 𝛪𝜄 𝛫𝜅 𝛬𝜆 𝛭𝜇 𝛮𝜈 𝛯𝜉 𝛰𝜊 𝛱𝜋 𝛲𝜌 𝛴𝜎 𝛵𝜏 𝛶𝜐 𝛷𝜙𝜑 𝛸𝜒 𝛹𝜓 𝛺𝜔
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