You might guess that someone taking a course in condensed matter physics in their fourth year of University might be subject to a little bit of tough work. You might guess that the topics are really complicated. You might guess that the prof assumes that you’re not learning scientific notation and basic trigonometry anymore. We’ll you’d be guessing wrong!

• Anyone remember the pythagorean theorem?
  
• Trigonometry from Grade 8 with a mistake in it?? A was supposed to be a unit vector.
  
• Scientific notation from Elementary school??
  

I’ll admit there might be evidence in the last photo that there is some tricky stuff going on, but consider how long it takes to write a partial derivative and how long it takes to draw a picture. The time investment isn’t where the “tricky stuff” is.