# Toronto Math Forum

## APM346-2018S => APM346--Lectures => Topic started by: Jingxuan Zhang on March 11, 2018, 05:46:54 PM

Title: potential
Post by: Jingxuan Zhang on March 11, 2018, 05:46:54 PM
http://www.math.toronto.edu/courses/apm346h1/20181/PDE-textbook/Chapter7/S7.2.html

My question is concerning equations $(9),(10)$. First what is $u(y)$ in fact? is that some sort of charge? is "charge" and "potential" the same? are they sort of energy? (You must know the asker is barely exposed to Physics.) Secondly, if $u=u(y)$ then what is meant by $\Delta u$?

Also I think it will be good if the online text is open to edit. Very often I can find such trivial typos that do not worth of posting here, but are nonetheless quite obstentious.
Title: Re: potential
Post by: Victor Ivrii on March 12, 2018, 03:00:44 AM
Wait for today lecture