# algebra > means completeness and balancing, from the Arabic word الجبر To install with npm do `npm install algebra`. Real numbers: ```ts import { R } from 'algebra'; const x = new R(0.1); x.add(0.2); console.log(x.value); // 0.3 ``` Complex numbers: ```ts import { C } from 'algebra'; const z = new C([1, 2]); // 1 + 2i const z_ = new C(z).conj(); // 1 - 2i console.log(z.mul(z_).eq(5)); // true ``` See full documentation here: https://fibo.github.io/algebra