We put to test the recently proposed non-linear flux ansatz for maximal
supergravity in eleven dimensions, which gives the seven-dimensional flux in
terms of the scalars and pseudoscalars of maximal N=8 supergravity, by
considering a number of non-trivial solutions of gauged supergravity for which
the higher dimensional solutions are known. These include the G2 and
SU(4)− invariant stationary points. The examples considered constitute a
very non-trivial check of the ansatz, which it passes with remarkable success.Comment: 23 page
