Let be a Space with Measure , and let
be a real function on the Product Space
. When

exists for measures , is called the mutual energy. is then called the Energy.

**References**

Iyanaga, S. and Kawada, Y. (Eds.). ``General Potential.'' §335.B in
*Encyclopedic Dictionary of Mathematics.* Cambridge, MA: MIT Press,
p. 1038, 1980.

© 1996-9

1999-05-26