  We study a particular exact solution to the Born-Infeld determinantal gravity
consisting of a cosmological model which undergoes a brusque bounce. The latter
consists of an event characterized by a non-null (but finite) value of the
squared Hubble rate occurring at a minimum (non-null) scale factor. The energy
density and pressure of the fluid covering the whole manifold are perfectly
well behaved in such an event, but the curvature invariants turn out to be
undefined there because of the undefined character of the time derivative of H.
It is shown that the spacetime results geodesically complete and singularity
free, and that it corresponds to a picture of an eternal Universe in which a
(somewhat unconventional) bounce replaces the standard Big Bang singularity.
This example tends to emphasize that, beyond Einstein's theory of General
Relativity, and in the context of extended theories of gravity formulated by
purely torsional means, the criterion of a singularity based on pathologies of
scalars constructed upon the Riemann curvature tensor, becomes objectionable.
