Special on Professor Gilbert Strang (MIT).

There is no such thing as an "instantaneous" rate of change unless a time differential is involved. And even then, it is never "instantaneous" because causal systems are not based on any particular mathematical model.

To talk about how fast a function is changing is absurd.

Read more about Prof. Gilbert Strang here:

https://groups.google.com/forum/#!topic/sci.math/1rGbFury97Q

You will be surprised as he is neither brilliant nor a good teacher. In fact, Strang is considered a felon in US law. Strang is a cowardly bastard who belongs behind bars.

I shall not forget or forgive his vile and disgusting behaviour on sci.math. As long as I breathe, I shall warn others of this low-life scum whom I absolutely loathe with every fibre of my being. He is not worthy of the air he breathes. The filthy pig will retire wealthy even though he has done substantial damage to my reputation and good character. This is the kind of trash that MIT hires and the same kind of trash that sits on committees such as the Abel Prize committee. Truly abhorrent and disgusting.

If I had the money, I'd hire a filthy lawyer and take every last penny I could from him.