  The Schwinger-de Witt and Hadamard methods are used to obtain renormalised
vacuum expectation values for the fermion condensate, charge current and
stress-energy tensor of a quantum fermion field of arbitrary mass on
four-dimensional anti-de Sitter space-time. The quantum field is in the global
anti-de Sitter vacuum state. The results are compared with those obtained using
the Pauli-Villars and zeta-function regularisation methods, respectively.
