A system predator-prey is explored and the parameters, by which its operating is stable. Biological balance of the system species is defined by mathematic methods.
A quantum statistical model of intramolecular tautomeric transformation is offered, accounts for the vibration of a proton as a result of its interaction with the surrounding medium simulated by the quantized field of radiation. Effective adiabatic potentials of the proton are approximated by the parabolas of various curvatures. The estimation for the vibrational relaxation time and the formula for the constant of tautomeric equilibrium.
Family of centered planes in projective space is investigated. It is shown that composite clothing of this family induces 6 bunches of group connections. In each of this bunches one connection is allocated. Their conditions of coinciding are found. Geometric interpretation each of them is done.