Stable and unstable spatially-periodic canards created in singular subcritical Turing bifurcations in the Brusselator system

The paper and the candidate solution agree on the spatial ODE formulation, the reduced/desingularized slow flow, the identification and type of the folded singularities (RFSN-II at B=1 and RFS for B>1), the existence and explicit characterization of the singular canards via a Hamiltonian first integral, the transversality that ensures persistence of a symmetric maximal canard for B>1+O(ε), and the geometric construction of spatially periodic canards by concatenating slow segments on S_s^ε with fast layer homoclinics. The only substantive technical discrepancy is the blow-up scaling: the paper uses the weights U=r^2, P=r^3, V=r^4, Q=r^3, ε=r^2, and the unfolding B=r^4, whereas the model states a different ‘standard’ FSN-II scaling. This mismatch does not alter the core conclusions but should be corrected for precision.