Terms for subject Mathematics containing developments in

English	Russian
is in a primitive state of development	на начальной стадии развития
in an advanced stage of development	на продвинутой стадии развития
in recent years the development of solid-propellant rocket motors intensified the need for solutions of various problems of	необходимость в решении различных проблем
in at the first stage of its development	на этапе