  The traditional formulation of the ultimate goal of physics (in the narrower
sense of axiomatic theory) involves the derivation of physical laws from first
principles. Though, such option doesn't make things easier since the task of
the first principles finding is not less complicated versus to the original
problem. The alternative path for understanding the world around us is to
interpret the fundamental limit values as a factor determining the physical
laws structure. A significant part of this path has already been completed. It
was possible to show that the quantum mechanics can be built on the basis of
the existence of the minimum quantum action, while the special theory of
relativity - on the maximum speed c. Furthermore, from rather recently it
became clear that a similar approach could be implemented in general relativity
but in this case it can be constructed by postulating the existence of a
minimum lengths. The goal of this review is to demonstrate the effectiveness of
limit values as a tool for describing the physics of the Planck scale.
Moreover, by virtue of their universality, the limit values allow us to
establish relationships between, on first glance, distant fields of physics. We
will consider the simplest consequences of the inclusion of gravitational
effects in quantum reality. The most important consequence of this
consideration is the inevitability of transition from the classical concept of
continuum to the concept of the discrete space-time. The new physics generated
by such transition will be in the center of our attention.
