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            <video:description>एक समुच्चय (set) A का एक उपसमुच्चय (subset) कोई भी ऐसा समुच्चय B होगा जहां B का प्रत्येक अवयव (element) A का भी एक अवयव है। एक उचित उपसमुच्चय (strict subset) एक ऐसा उपसमुच्चय (subset) होता है जो मूल समुच्चय (original set) के बराबर नहीं होता है। (अर्थात B में A से कम-से-कम एक अवयव कम होना चाहिए)। समुच्चय A का एक अधिसमुच्चय (superset) कोई भी ऐसा समुच्चय C होगा जहाँ A, C का एक उपसमुच्चय (subset) है।</video:description>
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            <video:description>Let&#39;s put what we know about sets to use and find subsets of some common sets of numbers (Real, Rational, Integers, Natural numbers, etc). After plotting all of them on a Venn Diagram, lets create a subset chain that goes from natural numbers all the way to real numbers.</video:description>
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