Four-body function

\[g_N^{(4)}(r_1,r_2,r_3,r_4)=\frac{g_N^{(3)}(r_1,r_2,r_3)g_N^{(3)}(r_1,r_2,r_4)g_N^{(3)}(r_2,r_3,r_4)g_N^{(3)}(r_1,r_3,r_4)}{g_{12}g_{13}g_{14}g_{23}g_{24}g_{34}}\]

See also

• Kirkwood superposition approximation

References

1. I. Z. Fisher and B. L. Kopeliovich, Doklady Akad. Nauk. USSR 133 81 (1960)
2. Yong-Teh Lee, Francis H. Ree and Taikyue Ree "Distribution Function of Classical Fluids of Hard Spheres. I", Journal of Chemical Physics 48 pp. 3506-3516 (1968)