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In page Semicolon:

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In the argument list of a mathematical function   f ( x 1 ,   x 2 ,     ;   a 1 ,   a 2 ,   ) , {\displaystyle \ f(x_{1},\ x_{2},\ \dots \ ;\ a_{1},\ a_{2},\ \dots )\;,} a semicolon may be used to separate variables from fixed parameters.[citation needed]