14 lines
159 B
Plaintext
14 lines
159 B
Plaintext
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import Mathlib.Data.Real.Basic
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notation "ℝ²" => ℝ × ℝ
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namespace Real
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/--
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The area of a unit circle.
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-/
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axiom pi : ℝ
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notation "π" => pi
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end Real
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