Extreme value is the limit value in mathematical language, referred to as extreme value, also known as limit.

The limit value is a function or sequence. With the infinite increase or decrease of the independent variable, it infinitely approaches a constant, and that constant is the extreme value. The formula is LIMF (x) = a.

x→∞

For the constant function f(x)=c(x belongs to r), and LIMF (x) = c.

x→∞