f(x), f of x, f(x) = x², f of x equals x squared, f(x) = x³, f of x equals x cubed, f(-x) = f(x), f of minus x equals f of x, f(-x) = -f(x), f of minus x equals minus f of x, y = x², y equals x squared, y ≥ 0, y is greater than or equal to zero, x > 3, x is greater than three, x = 0, x equals zero, (0, 0), the point zero, zero, (3, 0), the point three, zero, {1, 2, 3, 4}, a set containing one, two, three and four, (1, 4), an open interval from one to four, [1, 4], a closed interval from one to four, f(x) = 1/x, f of x equals one over x, 3 ∈ A, three is an element of A, A ⊂ B, A is a subset of B, A ∪ B, A union B, A ∩ B, A intersection B, lim x→2 f(x) = 4, The limit of f of x as x approaches two is four, lim x→2⁻ f(x) = 4, The limit of f of x as x approaches two from the left is four, lim x→2⁺ f(x) = 6, The limit of f of x as x approaches two from the right is six, lim x→2 f(x) = ∞, The limit of f of x as x approaches two is infinity, lim x→2 f(x) DNE, The limit of f of x as x approaches two does not exist

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