I	: Set of all metabolites;
J	: Set of all fluxes where reversible reactions are treated as two unidirectional reactions;
$c_j$	: Vector selecting unidirectional flux components with products in core (e.g., from reactions with non-currency metabolite products in the core, as well as reversible reactions with reactants in core);
$S_{ij}$	: Stoichiometry matrix;
$v_j$	: Flux value of reaction $j\in J$;
$u{b}_j,l{b}_j$	: Upper and lower bounds for j.