  By solving the rate equation in an expanding quark-gluon plasma, we study
thermal production of charm quarks in central Pb+Pb collisions at the Future
Circular Collider. With the charm quark production cross section taken from the
perturbative QCD at the next-to-leading order, we find that charm quark
production from the quark-gluon plasma can be appreciable compared to that due
to initial hard scattering between colliding nucleons.
