  We discuss the possibility of coexistence of spin density wave
(antiferromagnetism) and triplet superconductivity as a particular example of a
broad class of systems where the interplay of magnetism and superconductivity
is important. We focus on the case of quasi-one-dimensional metals, where it is
kown that antiferromagnetism is in close proximity to triplet superconductivity
in the pressure versus temperature phase diagram. Over a range of pressures, we
propose an intermediate non-uniform phase consisting of antiferromagnetic and
triplet superconducting orders. In the coexistence region, we propose a flop
transition in the spin density wave order parameter vector, which affects the
nature of the superconducting state.
