On studies of bifurcation phenomena such as memory and delay

For various researchers, the bifurcation phenomena of memory and delay are associated with the ideas about “dynamic bifurcation”, “slow time”, and “fast-slow systems”. The review presents an analysis of literary sources on these topics. According to the author's explanation of these phenomena proposed here, they should be classified as the manifestations of the structural instability of the system. The review is primarily intended for specialists in the field of mathematical biology.