Membranes for photocatalysis in wastewater treatment

Ontogenesis and phylogenesis in the passage from arithmetic to algebraic thought

With this work we retrace some of the fundamental historical and historical epistemological steps of the evolution of algebraic thought. Given the accepted parallelism between ontogenesis and phylogenesis we believe such a research to be a useful approach to the interpretation of obstacles and difficulties that students encounter during the acquisition of algebraic thought.