若f:[a,b]→ℝ為凸函數且a,b屬於ℝ,則下列不等式 f((a+b)/2)≤1/(b-a) ∫_a^b f(x)dx≤1/2[f(a)+f(b)] 恆成立 此不等式稱為Hermite-Hadamard不等式。 此論文主要是要探討若f在[a,b]中為凸函數,則是否存在實數𝓵和L滿足 f((a+b)/2) ≤ 𝓵 ≤ 1/(b-a) ∫_a^b f(x)dx ≤ L ≤ 1/2 [f(a)+f(b)]。
If f:[a,b]→R is convex on [a,b], then the inequality f((a+b)/2)≤1/(b-a) ∫_a^b f(x)dx≤1/2[f(a)+f(b)] holds. This is the classic Hermite-Hadamard inequality. There is the question that if f is convex on [a,b] whether there exist real numbers 𝓵 and L such that f((a+b)/2) ≤ 𝓵 ≤ 1/(b-a) ∫_a^b f(x)dx ≤ L ≤ 1/2[f(a)+f(b)].