For any twice differentiable function 𝑓: ℝ → ℝ, if at some 𝑥∗ ∈ ℝ, 𝑓′ (𝑥∗…

For any twice differentiable function 𝑓: ℝ → ℝ, if at some 𝑥∗ ∈ ℝ, 𝑓′ (𝑥∗ ) = 0 and 𝑓′′(𝑥∗ ) > 0, then the function 𝑓 necessarily has a ______ at 𝑥 = 𝑥∗ .

Note: ℝ denotes the set of real numbers.