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7.3.19 oppose
Syntax:
oppose ( ring_name, name )
Type:
- poly, vector, ideal, module or matrix (the same type as the second argument)
Purpose:
- for a given object in the given ring, creates its opposite object
in the opposite ( opposite) ring (the last one is assumed to be the current ring).
Remark:
- for any object
See
envelope;
opposite.
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