Fundamental task to generate the idea of <I>reductio ad absurdum</I>
(the 42th Conference of the International Group for the Psychology of Mathematics Education 2018)
On study and research responsibilities: A case in Japanese upper secondary school
(The 6th International Conference on the Anthropological Theory of the Didactic 2018)
Generating the raison d’être of logical concepts in mathematical activity at secondary school: Focusing on necessary/sufficient conditions
(The 6th International Conference on the Anthropological Theory of the Didactic 2018)