Number Classification

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In this video in the College Algebra series, learn what makes a number an integer, a real number, a whole number, and more.
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For natural numbers, I don't think it's appropriate to use interval notation [1, inf), which represents all real numbers not less than 1: x >= 1. Use set notation {1, 2, 3, ...}. You really should redo the video. I would hate that my students develop bad habits.

ming-lunho
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Every number which has place on real number line - sounds pretty stange for me.

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