Good Lord. Here's an excellent talk about why mathematics teachers should know mathematics: https://math.berkeley.edu/~wu/Lisbon2010_2.pdf https://math.berkeley

Good Lord. Here's an excellent talk about why mathematics teachers should know mathematics: https://math.berkeley.edu/~wu/Lisbon2010_2.pdf https://math.berkeley.edu/~wu/Lisbon2010_2.pdf That's mathematics, not didactics of mathematics.