generated from smyalygames/quartz
17 lines
388 B
Markdown
17 lines
388 B
Markdown
# What is countable?
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## Natural Numbers
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Quite simple
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$$\mathbb{N} = \{ 1, 2, 3, 4, \dots \}$$
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Which you can just add it up every time
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## Integer Numbers
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$Z$ can be countable as you can go
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$$1 \to 0$$
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$$2 \to 1$$
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$$3 \to -1$$
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$$4 \to 2$$
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$$5 \to -2$$
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and so on...
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Here they start at 0, then go 1, -1, 2, -2, etc...
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## Rational Numbers
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They are countable, but it is a lot more work to show |