From Förberedande kurs i matematik 1

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-	<math>\pi</math> är som kanske bekant ett tal med oändligt många icke-periodiskt upprepande decimaler och går därför inte att skriva med hjälp av heltal på bråkform. Talet <math>-\pi</math> har samma decimalutveckling och är alltså också ett irrationellt tal.	+	As you perhaps already know,
		+	<math>\pi</math> is a number with infinitely many non-periodically repeating decimals and therefore cannot be written in fractional form with the help of integers.
		+	The number <math>-\pi</math> has the same decimal expansion and is therefore an irrational number.
		+
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Current revision

As you perhaps already know, \displaystyle \pi is a number with infinitely many non-periodically repeating decimals and therefore cannot be written in fractional form with the help of integers. The number \displaystyle -\pi has the same decimal expansion and is therefore an irrational number.