14 lines
444 B
TeX
14 lines
444 B
TeX
% !TeX root = ../../script.tex
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\documentclass[../../script.tex]{subfiles}
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\begin{document}
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\section{Contents and Measures}
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\begin{defi}
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A set $M$ is said to be countable if there exists a surjective mapping from $\natn$ to $M$, i.e.
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\[
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\exists \seq{x} \subset M: ~~\forall y \in M ~\exists n \in \natn: ~~x_n = y
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\]
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A set $M$ is said to be countably infinite if it is countable and unbounded.
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\end{defi}
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\end{document} |