What is a Subset?Date: 10/13/2001 at 20:51:26 From: phillip kutsen Subject: What is a subset I would like to know what a subset is. Thank you. Date: 10/13/2001 at 21:46:04 From: Doctor Achilles Subject: Re: What is a subset Hi Phillip, Thanks for writing to Dr. Math. A set is just a group of things that you write down in a list. In math, you usually put {} around a set, and commas between items in the set. You can have a set of numbers, such as {1, 2, 5, -9, 2.63}, or a set of variables such as {x, a, m, y, z}, or a set of objects {table, desk, chair, computer}. You can even have mixed sets such as {couch, TV, 8, elephant, 2, -97, 55.2, 3x}. Let's say I have two sets. I'll call one of them "set1" and one of them "set2". set2 is a subset of set1 if everything in set2 is also in set1. So for example, the set {1, 2, 3} is a subset of the set {1, 2, 3, 4, 8}. And {elephant} is a subset of {couch, TV, 8, elephant, 2, -97, 55.2, 3x}. You can also have an empty set {}, which is a subset of all sets. I hope this helps. If you have any other questions, let me know, and I'd be happy to talk about this with you some more. - Doctor Achilles, The Math Forum http://mathforum.org/dr.math/ |
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