I heard that Heun method was second-order Runge-Kutta method (RK2). Why "second-order" ?
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2Why can't I accept an answer ? – May 15 '22 at 09:58
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1You need to wait for 15 minutes – Emile Couzin May 15 '22 at 09:58
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2Practical demonstration: steps, function evaluations and errors for Euler, Heun, RK3, RK4 – Lutz Lehmann May 15 '22 at 10:07
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"Second order" means that when the step size is devided by 2, the error is devided by 4.
Emile Couzin
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