I would guess they can "force" him to no longer teach that class, even if they can not dismiss him.

I don't think its bad that the university has the final say in what and to a certain degree how certain elements of the ciricullum are taught. It's not hard to imagine how a bad math course can very seriously compromise the students ability to follow other classes.

Not to say that this applies to this case, the professor proably made a good and ethical choice in class materials and is pressured for other reasons.

Strang's textbook is fantastic. One of the rare cases in college where I actually enjoyed reading a textbook. His lectures are available for free on YouTube as well, and I can't recommend them enough!

51% of Cal State Fullerton profs are adjuncts [1], so I'd assume this professor can be fired fairly easily.

[1] http://www.collegefactual.com/colleges/california-state-univ...

Tenured professors work for a department head.