In this paper, the method of creating deontic logics by defining axiomatic theories over the first-order predicate logic, is presented. These logics are constructed as theories of legal events or theories of acts. The paper refers to Bogusław Wolniewicz's Ontology of Situation, and indirectly to Wittgenstein's Tractatus logico-philosophicus.

This is an analytical paper where several concepts of responsibility used in law are distinguished and discussed. The concept of responsibility not related to the norms violation, and judged by an assessment of the acts value, is developed. Arguments are presented in favor of using this concept in the legal discourse.

In this paper, the natural law is understood as a set of logical consequences of basic legal concepts. Some basic legal concepts are defined in the language of first-order predicate logic, and some logical consequences of these definitions are derived and explained.

In Legal Reasoning and Logic, the system of classical rules for solving conflicts of legal norms is presented as an axiomatic theory over the first-order predicate logic. This article has been cited in many research papers on legal logic. 

This paper has been devoted to examination of semantic relations between legal norms when they are understood as sentences without logical value, i.e. the sentences that are neither true, nor false. Logic of programs has been used to define semantic relations similar to entailment, contradiction, opposition, and sub-opposition, between legal norms.

This paper examines the sources of paradoxes in deontic logics. Arguments are presented in favor of the thesis that in order to avoid paradoxes, deontic modalities should be constructed of aletic and ethical modalities.

In this paper, a propositional deontic logic is presented where deontic operators are constructed of aletic and ethical ones. I used this original and refreshing approach for the first time in my thesis defended at Lomonosov Moscow State University in 1991, entitled ‘A new approach to deontic logics creation’.