It is the multiplication operator. X is also probably the most commonly used letter for representing a variable in algebra and calculus. I was taught to always use a cursive x when representing a variable.
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In mathematics, a function F(x) is the antidifference of f(x) if F(x+1)-F(x)=f(x).
In normal mathematics, never.
domain = x-values range = y-values for which x or y is a solution
Many of them are taken from the Greek alphabet. plus, minus, mutiply and divide +-x/ are the basic symbol for mathematics + is for addition, - is for subtraction, x is for multiplication and / is for division
12m as in 3 x 4 = 12 and 12 x m = 12m in mathematics