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A critical comment on [N. Lanahan--Tremblay and V. Faraoni, 2007, {\it Class.Quantum Grav.}, {\bf 24}, 5667, arXiv:0709.4414] is given discussing thewell-formulation of the Chauchy problem for $f(R)$-gravity in metric-affinetheories.

A comment on "The Cauchy problem of f(R)- gravity", Class. Quantum Grav., 24, 5667 (2007), arXiv:0709.4414