2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103521On the basis of the Kac formula of the characteristic function of the random variable defined by values of the quadratic functional $J_T [w]$ on trajectories of the standard Wiener process $\{w\}$, the method of its distribution density is proposed.8 pagesMathematical Physics60J60The probabilitiy distribution density of random values of squared functional on Wiener process trajectoriestext