5+n=l5'+m+2Re(n)s5+n+25ml k+y6≤s+5+22lnl x,+y)=6+y6+2✉,ly 根据Holder不等式: 2空[2时:91片1a>0 p q M-(②s(②n≥2sml 小k+yL≤x+lyg 2.两类向量范数 4( ) 222 2 2 i i i i ii i i i i ξ +η = ξ + η + ξη ≤ ξ + η + ξ η 2Re 2 n 222 222 i i i 1 xy x y 2 = + ≤ + + ξη ∑ ( ) 2 2 2 2 2 2 2 22 x y x y 2x y + =++ 根据 Hölder 不等式: 1 1 n nn p q p q ii i i i 1 i 1 i 1 ab a b = = = ≤ ∑∑∑ , i i 1 1 p,q 1, 1,a , b 0 p q > += > 1 1 nn n 2 2 2 2 2 2 i i i i i 1 i 1 i 1 x y = = = = ξ η ≥ ξη ∑∑ ∑ ∴ 222 xy x y +≤ + 2. 两类向量范数 4