Tumor_Brusselator_operator 476 old_code/tumor_growth/tumor_code.h const Tumor_Brusselator_operator u_operator {u_model, u_approx, w_approx}; Tumor_Brusselator_operator 477 old_code/tumor_growth/tumor_code.h const Tumor_Brusselator_operator w_operator {w_model, u_n, u_n};