The commutator of X1 with X2
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| (3) |
The commutator of the third extensions of X1 and X2 involves four elements.
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| (4) |
The generators G1 and G2 associated to the lists X1 and X2
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| (8) |
If G1 and G2 are differential operators (mappings), the commutator of G1 and G2 is returned as a mapping as well:
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The commutator of the third extensions of G1 and G2
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| (10) |