How to get here
The Math Department is on the second floor of the smaller building called Pabellon I, which is just at the entrance of Ciudad Universitaria:
(note that in Argentina the street level is floor 0 and not floor 1).
Here is a closer look of the entrance door:
PLEASE NOTE THAT IF YOU TAKE A BUS, YOU SHOULD GET OFF AS SOON AS IT ENTERS CIUDAD UNIVERSITARIA BY THE PARKING LOT. YOU'LL HAVE TO CROSS THE PARKING LOT TO REACH PABELLON I. IF YOU TAKE A TAXI, TELL THE DRIVER TO TAKE THE RIGHT LANE IN THE BIFURCATION OVER THE BRIDGE THAT CROSSES THE RAILWAYS ( IN THE DIRECTION OF AEROPARQUE, THE DOMESTIC AIRPORT), AND THEN TO TURN LEFT AS SOON AS THE BRIDGE ENDS AT A SMALL ROND POINT TO ENTER CIUDAD UNIVERSITARIA. TAKE A LOOK AT THE GOOGLE MAP BELOW, WHERE PABELLON I IS THE BUILDING WITH A "II" ON WHITE ON THE ROOF
Here are two photos of the bigger building Pabellon II:
More pictures including some satellital ones