Remove the spaces from the following sentence: Given Petrovsky 's expertise in differential equations, the topology of algebraic curves and surfaces and mathematical physics, it is not difficult to see his influence on the direction that Oleinik's work would take.
GivenPetrovsky'sexpertiseindifferentialequations,thetopologyofalgebraiccurvesandsurfacesandmathematicalphysics,itisnotdifficulttoseehisinfluenceonthedirectionthatOleinik'sworkwouldtake.