f<0
f is concave down
The expression <0 represents a condition where a value must be less than zero. In mathematics, less than is represented by the symbol <. Therefore, the expression <0 means that the value being evaluated must be smaller than zero. For example, if we have a function f(x), and we want to find the values of x for which f(x) is less than zero, we would set up the inequality f(x) < 0. We can then use algebraic methods to solve for x and determine the range of values that satisfy the inequality. In summary, <0 means that a value must be less than zero, and it is commonly used in mathematical expressions and inequalities to describe a set of values that satisfy a particular condition.
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