Nonperturbative approach to(Wiener) functional integral with $\phi^4$   interaction
  We propose the another, in principe nonperturbative, method of the evaluation of the Wiener functional integral for $\phi^4$ term in the action. All infinite summations in the results are proven to be convergent. We finf the "generalized" Gelfand -- Yaglom differential equation implying the functional integral in the continuum limit. 
Juraj Bohacik and Peter Presnajder