Results: **3**

#### On the territorial **differences** in chain organisation of retail in the Russian Federation

The relatively rapid – however slower than forecasted — development o retail chains is characteristic of Russia in general, nevertheless it exhibits significant territorial **differences**. An attempt to identify the factors behind these **differences** through calculating the correlation coefficient made it possible to detect only one factor, whose value is close to essential: the geographical remoteness from Moscow. However, many ...

#### An mathematical simulation of ionosphere with due regard for its three-dimensional irregularity

**Difference** methods an approximate solution of a three-dimensional equation of ions diffusion with mixed derivatives and divergence first derivatives are considered. The task is reduced to a chain of three two-dimensional parabolic equations on base of ...

#### A finite **differences** approximation of the boundary value problem of a heat convection in the ladle with steel

... convective heat transfer in a ladle while blowing steel argon proposed finite-difference approximation of the original mathematical model of convective heat transfer in a continuous divergence form. Used stable and economical implicit monotone conservative **difference** scheme.
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2. Самарский А. А. Теория разностных ...