The reflection is an attempt on monitoring the structure of the argument field related to the a fortiori argument. In reaction to the no scarcely expressed statement concerning the unreliability of the typified application of this method of argumentation, the author strives to point out relevant structural points of the argument, mostly the inimitable foundation of the teleological background of the interpreted legal rule. By the indicated description he strives to pass from the intuitive application of the given argument to the rationalization, which is expressed by the presentment of preconditions which are usually suppressed if they are considered at all. In this connection, the author also stresses the fact that the a fortiori argument, usually leading to the extensive outcome of the interpretation, has connection with either the condition of normative pressure generation (hypothesis) or a normative result (disposition, sanction). The author also stresses the ambiguity of the application from the point of view of the selection of its alternatives - a minori ad maius and a maiori ad minus arguments. He points out the often related per reductionem ad absurdum argument, as well as the prevention of the application of the given argument resulting from the character of the relevant law and the above mentioned axiological foundation of the argument. After a historical excursus, the interpretation is supported by recent doctrinal opinions, practical examples and judicial practice. The author attempted to interconnect submitted opinions and views and to draw complex conclusions from them, adding the relevant argumentation points which have not been covered, and thus he defined in general features the structure of the field of argumentation of the application of the a fortiori argument.
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