If this doesn’t come out to be the determinant, you are about to hear a blood-curdling scream.

Linear algebra professor: *finishes off problem*

Student: *raises hand*

Professor: What did I do wrong?

Happy Halloween everyone! I’m glad we have class to day so I can show off my costume. Look I’m a hy-POT-enuse!

First you put on your shirt and then your jacket. But when you want to take off your clothes, you have to take the jacket off first. Undressing is inverse to dressing.

Obviously for Superman this doesn’t apply. He puts his pants on before his underpants.

So if you’re a mathematician, you just write ‘no solution’ and great; you’re done. But mathematicians don’t live in the real world.

One time I really needed to use the restroom during class, so I told my students I would draw a line as long as this answer. I started at the other end of the chalk board and ran out of the room.