Word Count : 214

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मान लीजिए $[a, \infty)$ एक समुच्चय है, जहाँ $a$ एक वास्तविक संख्या है। हम इसे विवृत (open) होने के परिभाषा के आधार पर सिद्ध करेंगे। समुच्चय $S \subset \mathbb{R}$ विवृत तब होता है जब इसके प्रत्येक बिंदु $x \in S$ के लिए __________ __________ _______ ______ _______ ____ _________ _______ ____ _____ ________.
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