不等式スレッド
>231
上式を I_n とおくと、I_n = [(n-1)/n] I_{n-2}.
∴ I_{2m+1} = (2m)!!/(2m+1)!!, I_{2m} = [(2m-1)!!/(2m)!!](π/2)
I_0 = π/2, I_1=1, I_2=π/4, I_3=2/3, ･･･ で単調減少
上式を I_n とおくと、I_n = [(n-1)/n] I_{n-2}.
∴ I_{2m+1} = (2m)!!/(2m+1)!!, I_{2m} = [(2m-1)!!/(2m)!!](π/2)
I_0 = π/2, I_1=1, I_2=π/4, I_3=2/3, ･･･ で単調減少
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