recreational mathematics

Noun

uncountable

(mathematics) Any use of mathematics or logic whose primary purpose is recreation, though often with more serious characteristics.

Japanese Meaning

娯楽や趣味を目的として数学や論理を応用する分野。単なる遊びとしてだけでなく、深い思考や厳粛な議論にも発展する側面を含む。

She spent the afternoon solving recreational mathematics problems that challenged both her creativity and logic.

彼女は午後を、創造力と論理力の両方に挑戦する娯楽としての数学問題を解いて過ごした。

Sense（1）

(mathematics) Any use of mathematics or logic whose primary purpose is recreation, though often with more serious characteristics.