| http://www.w3.org/ns/prov#value | - It has been represented by the Greek letter ?? since the mid-18th century. in 1971 Pi was officially classed as an irrational number, which means that it cannot be expressed exactly as a ratio of two integers (such as 22/7 or other fractions that are commonly used to approximate Pi); consequently, its decimal representation never ends and never repeats.
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