ODE Integrators

Euler, midpoint, RK4 and velocity Verlet — measured against a closed form, one thread per trajectory.

6 tasks

1. One Thread, One Whole Trajectory
2. Halve the Step, Halve the Error
3. Look Before You Leap
4. Four Slopes, Weighted
5. Velocity Verlet: the Symplectic Step
6. Payoff: RK4 Drifts, Verlet Does Not

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