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ordered_pair [2014/03/21 11:11]
127.0.0.1 external edit
ordered_pair [2014/12/08 10:15] (current)
nikolaj
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 This induces the n'th projection $\pi_n$ alla $\pi_3(\langle x_1,​x_2,​x_3,​x_4,​x_5\rangle)=\pi_2(\pi_1(\pi_1(\langle x_1,​x_2,​x_3,​x_4,​x_5\rangle)))$. This induces the n'th projection $\pi_n$ alla $\pi_3(\langle x_1,​x_2,​x_3,​x_4,​x_5\rangle)=\pi_2(\pi_1(\pi_1(\langle x_1,​x_2,​x_3,​x_4,​x_5\rangle)))$.
 +
 +=== For non-negative integers ===
 +There are bijections between $\mathbb N$ and ${\mathbb N}^2$ and so one can encode pairs of numbers as numbers.
  
 === Reference === === Reference ===
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