isLeftRegular(x,n) or isRightRegular(x,n)
Given an element x in an NCRing, isLeftRegular returns true if a*x=0 implies a=0 for all a in the specified homogeneous degree n. Likewise isRightRegular returns true if x*a=0 implies a=0 for all elements a of degree n. The method calls leftMultiplicationMap or rightMultiplicationMap as appropriate and checks the kernel in the specified degree.
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The object isLeftRegular is a method function.