Category:Mathematics

I took seven courses in calculus and linear algebra while attending university. This subject was, by far, my strongest. This category will contain articles pertaining to the subject of mathematics. I will use this category mainly for my easy reference.

Sub-Categories

• Algebra
• Trigonometry
• Calculus
• Linear Algebra

CAS and numerical analysis

• wikipedia:GNU Octave — a free computer program for performing numerical computations which is mostly compatible with MATLAB
• wikipedia:Mathomatic — a free, portable, general purpose computer algebra system (CAS)

Misc

Note: Sandbox entry

Al-Khwārizmī's method of solving linear and quadratic equations worked by first reducing the equation to one of six standard forms (where b and c are positive integers)

• squares equal roots (x² = bx)
• squares equal number (x² = c)
• roots equal number (bx = c)
• squares and roots equal number (x² + bx = c)
• squares and number equal roots (x² + c = bx)
• roots and number equal squares (bx + c = x²)

Cool numbers

• 163
• Khinchin's constant, K ~2.685252...
• The Euler-Mascheroni Constant, γ ~0.577215...
• The Monster, |M|=808017424794512875886459904961710757005754368000000000
• The Oddest Prime: 2
• Feigenbaum's constant, δ ~4.669201...
• (pi)^2/6
• 78,557
• 691
• The Golden Ratio, φ 1.618...

Mental calculation

see: Mental calculation, Vedic_mathematics, Trachtenberg system

• Vertically and crosswise: 46x72

 4           6
 |     x     |
 7           2
4x7 4x2+6x7 6x2
 15       1        # <- carry
 28      50  12
=3312

• Vertically and crosswise: 24x13

 2           4
 |     x     |
 1           3
2x1 2x3+4x1 4x3
  1       1        # <- carry
  2      10  12
=312

External links

Wikipedia related

Wikipedia and its sister project, WikiBooks, have many really good articles on just about everything related to mathematics. I will list some of the best articles (and categories) here:

• WikiBooks - Wikiversity - School of Mathematics
• Wikipedia category on mathematics
• Wikipedia article on mathematics

Other

• MathWorld — by Wolfram Research
• The Wolfram Integrator — by Wolfram Research
• PlanetMath.org — a collaboratively created, virtual community which aims to help make mathematical knowledge more accessible.
• PlanetPhysics.org — a collaboratively created, virtual community which aims to help make physics knowledge more accessible.