supersearches: logic
sidesearches: physics,
philosophy
subsearches: arithmetic,
elementary (high school/college) algebra, calculus,
linear algebra,
real analysis,
abstract algebra,
General resources
Wikipedia,
Wolfram mathworld,
Citizendium,
NWE
AoPS wiki,
Math wiki,
nLab,
HyperMath,
PlanetMath
MIT Open Courseware
Khan Academy,
Knowino
Proof Wiki
Brilliant.org articles
Tricki
- Math problem solving techniques wiki
Math Stack Exchange
- Math Q&A website
Few-subject resources
3Blue1Brown
Math Proofs Jrensen
Eqworld
- differential, integral and functional equation exact
solutions
Human knowledge
Calculators
Desmos 3d graphing
Wolfram Alpha
Other tools
OEIS - Integer
sequences lookup
Detexify,
All LaTeX symbols list
- Find LaTeX symbols tools
Math genealogy
Floating point math
0.30000000000000004.com
Prime numbers
Prime wiki
Prime factorization visualization
GIMPS
- Lend your computer to help find (mersenne) primes
t5k.org
Pending
Euler Map Theorem (V-E+F=2) Visual Proof
Wrath of Math: is everybody teaching this math wrong?
Wrath of Math: linear algebra playlist
Trachtenberg system of multiplication
Math map (quanta magazine)