MathWorld Updated 2025-07-16
Written mostly by Eric W. Weisstein.
Ciro once saw a printed version of the CRC "concise" encyclopedia of mathematics. It is about 12 cm thick. Imagine if it wasn't concise!!!
Infinite Napkin is the one-person open source replacement we needed for it! And OurBigBook.com will be the final multi-person replacement.
NLab Updated 2025-07-16
Decent encyclopedia of mathematics. Not much motivation, mostly statements though.
Created by:
PlanetMath Updated 2025-07-16
Joe Corneli, of of the contributors, mentions this in a cool-sounding "Peeragogy" context at metameso.org/~joe/:
I earned my doctorate at The Open University in Milton Keynes, with a thesis focused on peer produced support for peer learning in the mathematics domain. The main case study was planetmath.org; the ideas also informed the development of “Peeragogy”.
ProofWiki Updated 2025-07-16
MediaWiki-based.
This appears to be the creator: github.com/externl "Joe George".
Advertising Updated 2025-07-16
If a product of a big company has a catchy name it came from an acquisition Updated 2025-07-16
Meal deal Updated 2025-07-16
x.com/Birdyword/status/1777591446612193667Singaporean taxi drivers are the cutest.
A while ago a Singaporean taxi driver asked me what a UK hawker centre lunch might cost. I explained that there aren't any. He asked what office workers ate, and I explained the concept of Meal deals. And he looked at me with such a powerful combination of pity and revulsion.
Atlas (topology) Updated 2025-07-16
Collection of coordinate charts.
Covariant derivative Updated 2025-07-16
Differentiable manifold Updated 2025-07-16
Tangent space Updated 2025-07-16
Bibliography:
- www.youtube.com/watch?v=j1PAxNKB_Zc Manifolds #6 - Tangent Space (Detail) by WHYB maths (2020). This is worth looking into.
- www.youtube.com/watch?v=oxB4aH8h5j4 actually gives a more concrete example. Basically, the vectors are defined by saying "we are doing the Directional derivative of any function along this direction".One thing to remember is that of course, the most convenient way to define a function and to specify a direction, is by using one of the coordinate charts.
- jakobschwichtenberg.com/lie-algebra-able-describe-group/ by Jakob Schwichtenberg
- math.stackexchange.com/questions/1388144/what-exactly-is-a-tangent-vector/2714944 What exactly is a tangent vector? on Stack Exchange
One-form Updated 2025-07-16
www.youtube.com/watch?v=tq7sb3toTww&list=PLxBAVPVHJPcrNrcEBKbqC_ykiVqfxZgNl&index=19 mentions that it is a bit like a dot product but for a tangent vector to a manifold: it measures how much that vector derives along a given direction.
Chinese character Updated 2025-07-16
Backstory Updated 2025-07-16
Damsel in distress Updated 2025-07-16
Everybody Was Kung-Fu Fighting (trope) Updated 2025-07-16
Guns Are Worthless Updated 2025-07-16
Lotus-Eater Machine Updated 2025-07-16
Fan service Updated 2025-07-16
There are unlisted articles, also show them or only show them.