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kernel -- kernel of a ringmap, matrix, or chain complex

Synopsis

Optional inputs:
- SubringLimit => ...,

Ways to use `kernel` :

kernel(ChainComplexMap) -- kernel of a chain complex map
kernel(GradedModuleMap), see kernel(ChainComplexMap) -- kernel of a chain complex map
kernel(Matrix) -- kernel of a matrix
kernel(RingElement), see kernel(Matrix) -- kernel of a matrix
kernel(RingMap) -- kernel of a ringmap