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↓ ABCD schemes
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table of coefficients (about 18 digits) (.txt) AB scheme, real: PP 1/2 S
s=1, p=1 (Lie-Trotter)
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LEM: 1.0
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Let (I) = given scheme, and (II) = (I) applied with A,B exchanged
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Then the additive scheme ((I)+(II))/2 has order p=2 (Strang 1968);
LEM: √2/2
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((I)-(II))/2 is local error estimator for (I)
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