empty regular chain
The command Empty(R) returns the empty regular chain of R, that is the regular chain of R with no polynomials.
This command is part of the RegularChains[ChainTools] package, so it can be used in the form Empty(..) only after executing the command with(RegularChains[ChainTools]). However, it can always be accessed through the long form of the command by using RegularChains[ChainTools][Empty](..).
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