The infinity sign is conventionally interpreted as meaning that the variable grows arbitrarily large towards infinity-rather than actually taking an infinite value. For instance, in mathematical expressions with summations and limits such as the one below: In mathematics, the infinity symbol is used more often to represent a potential infinity, rather than an actually infinite quantity as included in the extended real numbers, the ordinal numbers and the cardinal numbers (which use other notations). This symbol is not used anymore, and is not encoded as a separate character in Unicode. Euler freely performed various operations on infinity, such as taking its logarithm. Leonhard Euler used an open variant of the symbol in order to denote "absolutus infinitus". Wallis did not explain his choice of this symbol, but it has been conjectured to be a variant form of a Roman numeral for 1,000 (originally CIƆ, also CƆ, which was sometimes used to mean "many"), or a variant of the Greek letter ω (omega)-the last letter in the Greek alphabet. However, John Wallis is credited with introducing the infinity symbol with its mathematical meaning in 1655, in his De sectionibus conicis. The shape of a sideways figure eight has a long pedigree for instance, it appears in the cross of Saint Boniface, wrapped around the bars of a Latin cross. Hold the ALT key and type 236 on the num-lockĬopy ∞ from here and paste it in your web page.Ĭopy ∞ from here and paste it in your Facebook page. Hold the ALT key and type 236 on the num-lock keypad.
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