LIGHT CONVERSION IN THIN FILMS OF A MIXTURE OF MESOTETRAPHENYLPORPHYRIN AND ERBIUM-DOPED YTTRIUM VANADATE CRYSTALLITES: 2. OPTICAL PROPERTIES
Russian Journal of Physical Chemistry B. Том 10. 2016. С. 566-569
We introduce (q1, q2)-quasimetric spaces and examine their properties. Covering mappings between (q1, q2)-quasimetric spaces are investigated. Sufficient conditions for the existence of a coincidence point of two mappings acting between (q1, q2)-quasimetric spaces such that one is a covering mapping and the other satisfies the Lipschitz condition are obtained. © 2016, Pleiades Publishing, Ltd.