Аннотация:
If for any finite subset $M$ of a countable skew field $ R $ there exists an infinite subset $ S\subseteq R $ such that $r\cdot m=m\cdot r$ for any $r\in S $ and for any $m\in M$, then the skew field $ R $ admits:
– A non-discrete Hausdorff skew field topology $ \tau _0 $.
– Continuum of non-discrete Hausdorff skew field topologies which are stronger than the topology $ \tau _0 $ and such that $ \sup \{\tau _1, \tau _2 \} $ is the discrete topology for any different topologies $ \tau_1$ and $\tau _2 $;
– Continuum of non-discrete Hausdorff skew field topologies which are stronger than $ \tau _0 $ and such that any two of these topologies are comparable;
– Two to the power of continuum Hausdorff skew field topologies stronger than $ \tau _0 $, and each of them is a coatom in the lattice of all skew field topologies of the skew fields.
Ключевые слова и фразы:countable skew fields, center of skew field, topological skew fields, Hausdorff topology, basis of the filter of neighborhoods, number of topologies on countable skew fields, lattice of topologies on skew fields, right Ore condition, ring of right quotients, ring of polynomials in the variable $x$.