Additional term of Log[e] in performing partial derivative

Questions
1

Hi;

When taking a partial derivative of:

D[x e^y, y]

I end up with an additional Log[] term:

e^y x Log[e]

Where is the Log[E] coming from? When performing these calculations manually, I would end up with e^y x without the additional term of Log[e] - see attached notebook.

Thanks,

Mitch Sandlin

Log_e_Question.nb (3.78 KB)

2

e vs E: E: Euler's number (base of the natural logarithm)—Wolfram Documentation