In the case of coefficients in a ring, "non-constant" must be replaced by "non-constant or non-unit" (both definitions agree in the case of coefficients in a field).
Ring kasus koefisien ring tengahin lingkaran, "non-konstan" patut kagentosin sareng "non-konstan utawi non-unit" (makakalih teges cumpu ring kasus koefisien ring lapangan).