# Mathematics: Random Interesting Math Stuff

Mathematics: Pi, golden ratio, calculus, algebra, complex analysis, differential equations, functions, graph theory, game theory, geometry, Euclid, Newton, mathematical biology, mathematical finance, computer science. We're not covering it, just random math picking and poking.

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**Math basics!** Numbers describe quantity. Natural numbers are *1, 2, 3, 4 ...* and so on. Then there's zero, the idea of infinity. Rational numbers like *1/3*, squares like *x ^{2}* and powers like

*x*. Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23 (divisible by themselves and 1). Number systems like decimal and binary.

^{n}## Golden Ratio 1.618...

The golden ratio 1.6180339887498948482.. = φ = ϕ = phi

## e 2.718

e = 2.71828... or the limit of (1 + 1/n) n as n approaches infinity. 1 + 1/1 + 1/(1*2) + 1/(1*2*3) ...

## Pi π 3.14159

Pi or π is the ratio of a circles circumference to its diameter. Irrational number.

## Prime numbers

Can only be divided with 1 and the number itself. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, ...

## Tau

Because π is wrong?

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