At the entrance.

No !!!!!!!!!!!!

They got lost and after much fuss had to get help.

The mathematicians are

HYPATIA BHASKARA MERSENNE PYTHAGORAS LEIBNITZ AREL NEWTON DESCARTES EUCLID GERMAIN DUCHATELET PLATO EINSTEIN CARDANO HERON ABEL PASCAL GALOIS FERMAT EULER MONGE AGNESI TARTAGLIA JONES FIBONACCI

Einstein is on the bike, Euler on a stamp, Galois before the duel, Maria Agnesi after she quit maths.