I just installed Maple 2018.   There are long delays when typing imput into a worksheet.  Never had this problem with Maple 2017. I assume that there is some new debugging going on during my input.  But, whatever it is, is there a way to turn it off?

with(Physics[Vectors]);

This should  equal Dirac delta function

I know this must have been addressed somewhere previously.  However I have searched extensively and not been able to find an answer.  Sorry for asking again.

I am trying to learn how to use the Physics tensor routines by using a simple 2D example.  In the following, I set up the Cartesian Euclidean metric tensor and then tried to transform to cylindrical coordinates.  The metric tensor is correctly transformed in line (5), but then when it is called in line (7), it still has Cartesian values.  What am I doing wrong?

How do I take the square root of :

    X:= r² (R + r cos(v))²

with the condition that R and r are positive and R>r and get:

r (R+ r cos(v))

I assume I need to use simplify with some assumptions, but I cannot figure it out.  

I tried a number of "simplify" options, none of which yielded the desired simple result.