Backward differentiation formulae 5 Numerical results 4 Ordinary differential equations 4 Stiff ordinary differential equations 4 stiff 4 Block method 3 Initial value problems 3 Numerical methods 3 Computation time 2 INITIAL-VALUE PROBLEMS 2 STIFF 2 Stability regions 2 Step size 2 Stiff 2 Stiff ODEs 2 Stiff initial value problems 2 Variable order 2 Variable step 2 Variable step size 2 backward differentiation formulas 2 block method 2 stability 2 A-stable 1 Adam 1 Adaptive BDF2 method 1 Algorithms 1 Approximate solution 1 BBDF methods 1 Block Backward Differentiation 1 Block Backward Differentiation Formula 1