stiffness_matrix_lhs  238 old_code/tumor_growth/tumor_growth.h     double stiffness_matrix_lhs {0.};
stiffness_matrix_lhs  466 old_code/tumor_growth/tumor_growth.h       stiffness_matrix_lhs = uniform_time_step;
stiffness_matrix_lhs  471 old_code/tumor_growth/tumor_growth.h       stiffness_matrix_lhs = uniform_time_step * diffusion;
stiffness_matrix_lhs  514 old_code/tumor_growth/tumor_growth.h     du_p_dchi *= stiffness_matrix_lhs;