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You are watching: There are more rational numbers than irrational


The answer below is the there space in fact far, far an ext irrational numbers than there are rational numbers. One way to think around this is the between any kind of two rational numbers, there space an infinite variety of irrational numbers.

there is fairly a little bit of background knowledge compelled to understand...

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The answer below is that there are in fact far, far much more irrational numbers than there space rational numbers. One way to think around this is the between any kind of two reasonable numbers, there space an infinite number of irrational numbers.

There is quite a little bit of background knowledge required to understand the answer to this question, and also I will certainly attempt to give an overview. We must first define a couple of terms. We call the variety of elements in a collection the cardinality of the set. For example, the collection 1, 2, 3 has actually cardinality 3. 2 sets are claimed to have the same cardinality if a bijection have the right to be formed in between the sets. Us can expand the notion of cardinality to boundless sets, and also we say the the collection of organic numbers `NN` has cardinality `aleph_0` (aleph null).

Any collection that has cardinality `aleph_0` is stated to be countably infinite. The set of all actual numbers `RR` was famously presented by Georg Cantor to have actually cardinality `aleph_1 = 2^(aleph_0)` . (See reference link "Cantor"s diagonal line argument"). This number is dubbed the cardinality that the continuum, and a set with this cardinality is said to it is in uncountably infinite.

It has actually been displayed that the irrational number are uncountably infinite (they have cardinality `aleph_1` ).

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However, the rational numbers are countably infinite (have cardinality `aleph_0`). To display that a collection has cardinality `aleph_0`, you have to construct a bijection (one-to-one and onto function) between the set in question and also the herbal numbers. An bijection between the rational numbers and the herbal numbers is presented in reference <3>. As such, we recognize that the reasonable numbers have cardinality `aleph_0`.

It complies with that over there are an ext irrational numbers than rational numbers, due to the fact that there space `aleph_0` reasonable numbers and `aleph_1` irrational numbers, and also `aleph_0

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