supersearches: [logic]
sidesearches: physics,
philosophy
subsearches: [arithmetic],
[elementary (high school/college) algebra], [calculus],
linear algebra,
[real analysis],
[abstract algebra],
General resources
Wikipedia,
Citizendium,
NWE
AoPS wiki,
Math wiki,
nLab,
HyperMath,
PlanetMath
MIT Open Courseware
Khan Academy,
Knowino
Proof Wiki
Brilliant.org articles
Tricki
Math Stack Exchange
Few-subject resources
3Blue1Brown
Math Proofs Jrensen
Eqworld
Human knowledge
Calculators and graphing
Desmos 2d graphing
Desmos 3d graphing
Other tools
OEIS
All LaTeX symbols list
Math genealogy
Floating point math
0.30000000000000004.com
Prime numbers
Prime wiki
Prime factorization visualization
GIMPS
The Prime Pages
Pending
Euler Map Theorem (V-E+F=2) Visual Proof
Wrath of Math: is everybody teaching this math wrong?
Trachtenberg system of multiplication
Math map (quanta magazine)
https://www.malinc.se/