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7.7.13.0. isCentral
Procedure from library nctools.lib (see nctools_lib).
- Usage:
- isCentral(p); p poly
- Return:
- int, 1 if p commutes with all variables and 0 otherwise
- Purpose:
- check whether p is central in a basering (that is, commutes with every generator of the ring)
- Note:
- if
printlevel > 0, the procedure displays intermediate information (by default, printlevel =0 )
Example:
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