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| (1) |
The LHPDO Delta acts on an ordered pair of expressions, and returns a list of 4 elements.
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| (2) |
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| (6) |
Operator constructed from differential expressions with partial dependencies:
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| (7) |
| (9) |
The operator U is constructed to act on functions [u(x),v(y)], and it is an error to ask it to act on expressions with more general dependencies: