R പ്രൈം, R ന്റെ ഒരു ഉപറിംഗാണ്; അതിനർ ത്ഥം, ഇത് സങ്കലന ഗുണനത്തിന് കീഴിൽ അടച്ചിരിക്കുന്ന ഒരു ഉപ സെറ്റാണെന്ന് ഓർക്കുക ഇത് വാസ്തവത്തിൽ, ഗുണനത്തിന് കീഴിലുള്ള ഒരു ഉപറിംഗാണ്.
అంటే, ఇది సంకలనం గుణకారంలో మూసివేయబడిన సబ్సెట్ అని గుర్తుంచుకోండి మరియు ఇది వాస్తవానికి, అదనంగా కింద ఉన్న సబ్ గ్రూప్ లో ఉంటుంది.