TY - JOUR AU - Zbigniew Semadeni TI - The triple nature of mathematics: deep ideas, surface forms and formal models JO - Didactica Mathematicae PY - 2024 SP - 115 EP - 171 VL - 46 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/dm.v46i0.7380/ DO - 10.14708/dm.v46i0.7380 LA - pl ID - 10_14708_dm_v46i0_7380 ER -