[Тэкст даступны толькі на англійскай мове] In mathematics, x is commonly used as the name for an independent variable or unknown value. The usage of x to represent an independent or unknown variable can be traced back to the Arabic word šay' شيء = “thing,” used in Arabic algebra texts such as the Al-Jabr. It was subsequently taken into Old Spanish with the pronunciation /ʃei/, which was written xei and soon habitually abbreviated to x. (The Spanish pronunciation of ⟨x⟩...[Тэкст даступны толькі на англійскай мове] In mathematics, x is commonly used as the name for an independent variable or unknown value. The usage of x to represent an independent or unknown variable can be traced back to the Arabic word šay' شيء = “thing,” used in Arabic algebra texts such as the Al-Jabr. It was subsequently taken into Old Spanish with the pronunciation /ʃei/, which was written xei and soon habitually abbreviated to x. (The Spanish pronunciation of ⟨x⟩ has changed since.) This started the habit of using letters to represent quantities in algebra.
It may also be used to signify the multiplication operation when a more appropriate glyph is unavailable. In mathematics, an "italicized x" () is often used to avoid potential confusion with the multiplication symbol. Another usage of X in mathematics is which is used to represent the cross product.
It may also be used to signify the multiplication operation when a more appropriate glyph is unavailable. In mathematics, an "italicized x" () is often used to avoid potential confusion with the multiplication symbol. Another usage of X in mathematics is which is used to represent the cross product.
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Fabrizio Nocci
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