1987'3, p.133
Gankova Z. A.
Development of the proving reasoning in youth
(RESUME)

Proving as a logical operation is regarded in two aspects: as an investigative activity and as a method of promotion of thinking activity in schoolchildren. Peculiarities of proving in subjects belonging to different age groups show that this type of logical thinking goes on developing in the period of youth. Results of a teaching experiment testify that logical thinking, appearance of logical operations significantly depend on the way they are taught and acquired.