Confusion regarding fermi-dirac distribution function

The fermi dirac distribution function given in http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/disfd.html is different from what I learnt. What I learnt had the chemical potential $$\mu$$ in place of $$E_F$$ . Isn't $$\mu$$ only equal to $$E_F$$ when $$T = 0$$ ? Or am I mixing stuff up?