I have paid attention to artworks of Ivan Kafka especially to the problem of multiplicity. On the background of the reseach of Kafka's work I have described some aspects of his art work in more common way: dealing with time, with space and with multiplicity. I have shortly analyzed first two aspects. On the other hand is multiplicity much wider phenomena, I have defined with categories which were created specially for this work. The category of mass is defined by non-living unifique parts of one coplex without any autonomy. The second type labeled as crowd type, typically contains some level of individuality. On such background I tried to create a diagramatic structure, which was postulated according to Rolasind Krauss'es "expanded fields". This should better show the relations between terms like mass, crowd, seriality and serial type of multiplicity. I have also applied these categories on particular Ivan Kafka's artworks, but in the end I suggest to asser this system of multiplicity categories on other artists artworks as well.

Presented dissertation discusses the influence of electromagnetic fields on the weight of the particles, which are considered in this work as substances with the hub. Theoretical knowledge was practically tested on plant organisms (early somatic embryos, fungal pathogens), theoretically the influence of electromagnetic field on cell structure was modeled. It was subsequently confirmed by a practical experiment assumption about the influence of electromagnetic fields on the weight of the particles. These experiments were preceded by a theoretical study of the problem and the formulation of a solution using Maxwell's equations, from which other descriptive equations and formulas were derived. The results of the experiments were presented at several professional conferences and published in professional journals and proceedings.