A note on the generalized Laplacian operators
Kunio Aki · Kodai Mathematical Journal · 1950
The present states of affairs in Japan do not assure me whether my efforts are new or not, still I venture to make my report concerning the following theorem, the proof of which seems yet to be found in no literature. Theorem.A necessary and sufficient condition for a function tuβ.) , continuous in a .givendomain Q-, being subharmonic is that, for every point Q, in Gj-,