r/mathbooks

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Math education! Anything math related that is useful for education, teachers, or students. There should be an emphasis on usefulness (such as good internet resources or ideas for how to teach a concept). Note: This is not a subreddit to publicize each post in your (or any single) blog or website, but rather to point out resources you've found that you could actually see bringing something useful to a math class.
https://reddit.com/r/matheducation/
r/learnmath
131k  subs
Post all of your math-learning resources here. Questions, no matter how basic, will be answered (to the best ability of the online subscribers).
https://reddit.com/r/learnmath/
r/mathematics
32k  subs
/r/mathematics is a subreddit dedicated to focused questions and discussion concerning mathematics.
https://reddit.com/r/mathematics/
r/CasualMath
9k  subs
This is a subreddit that is meant to be somewhere inbetween /r/math and /r/learnmath.
https://reddit.com/r/CasualMath/
r/compsci
598k  subs
Computer Science Theory and Application. We share and discuss any content that computer scientists find interesting. People from all walks of life welcome, including hackers, hobbyists, professionals, and academics.
https://reddit.com/r/compsci/
r/statistics
82k  subs
This is a subreddit for discussion on all things dealing with statistical theory, software, and application. We welcome all researchers, students, professionals, and enthusiasts looking to be a part of an online statistics community.
https://reddit.com/r/statistics/
r/Physics
859k  subs
The aim of /r/Physics is to build a subreddit frequented by physicists, scientists, and those with a passion for physics. Papers from physics journals (free or otherwise) are encouraged. Posts should be pertinent, meme-free, and generate a discussion about physics. Please report trolls and intentionally misleading comments.
https://reddit.com/r/Physics/
Welcome to the University of Reddit, a place for redditors to teach redditors.
https://reddit.com/r/UniversityofReddit/
r/haskell
45k  subs
The Haskell programming language community. Daily news and info about all things Haskell related: practical stuff, theory, types, libraries, jobs, patches, releases, events and conferences and more...
https://reddit.com/r/haskell/
A place for poking fun at the bad mathematics that plagues the internet
https://reddit.com/r/badmathematics/
r/askmath
12k  subs
A subreddit for math questions. Do you have a math question? Can you help others with their math questions? Come join us!
https://reddit.com/r/askmath/
r/ECE
71k  subs
A subreddit for discussion of all things electrical and computer engineering.
https://reddit.com/r/ECE/
r/algorithms
62k  subs
Computer Science for Computer Scientists
https://reddit.com/r/algorithms/
r/vim
85k  subs
For Vim enthusiasts and anyone interested in Vim.
https://reddit.com/r/vim/
r/linux
414k  subs
All things Linux and GNU/Linux -- this is neither a community exclusively about the kernel Linux, nor is exclusively about the GNU operating system.
https://reddit.com/r/linux/
r/matlab
23k  subs
Official MATLAB subreddit - a place to discuss the MATLAB programming language and its implementation.
https://reddit.com/r/matlab/
r/eebooks
10k  subs
An archive of links to **published** electrical/computer engineering textbooks that have been released online for free by their authors/publishers (no pirated books are allowed!)
https://reddit.com/r/eebooks/
r/emacs
32k  subs
The extensible, customizable, self-documenting real-time display editor.
https://reddit.com/r/emacs/