ガンマ関数
886 {\displaystyle \Gamma \left({\frac {3}{2}}\right)\,={\frac {\sqrt {\pi }}{2}}\approx 0.886\,} Γ ( 2 ) = 1 ! = 1 {\displaystyle \Gamma (2)\,=1!=1\,} Γ ( 5 2 ) = 3 π 4 ≈ 1.329 {\displaystyle \Gamma \left({\frac {5}{2}}\right)\,={\frac {3{\sqrt {\pi }}}{4}}\approx 1.329\,} Γ ( 3 ) = 2 ! = 2 {\displaystyle \Gamma (3)\,=2!=2\,} Γ ( 7 2 ) = 15 π 8 ≈ 3.323 {\displaystyle \Gamma \left({\frac {7}{2}}\right)\,={\frac {15{\sqrt {\pi }}}{8}}\approx 3.323\,} Γ ( 4 ) = 3 ! = 6 {\displaystyle \Gamma (4)\,=3!=6\,}