The Mathematics is in the Applied Physics and Mathematics building which is
opposite the Muir upper lot as indicated on the map at;
Math Building and Parking lot Google Map (Get Directions Here.)
I suggest you click on the P
symbol on the map and then choose
directions" to get directions from your location to this parking lot.
Here is a campus map for reference with the mathematics building and parking
lot outlined in red.
UCSD Campus Map.pdf