... played an important role in the development of the theory of the kernel and its generalisations to several variables, notably to pseudo-conformal transformations in space of more than three dimensions.
... nilalaro ng isang mahalagang papel sa pag-unlad ng teorya ng kernel at ang kanyang generalisations sa ilang mga variable, kapansin-pansin na hindi tunay-conformal transformations sa espasyo ng higit sa tatlong sukat.