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# Limits

### Definitions

What is an interval? A interval is a set of real numbers with the property that any number that lies between two numbers in the set is also included in the set
What is the domain of a function? The domain of definition of a function is the set of "input" or argument values for which the function is defined. That is, the function provides an "output" or value for each member of the domain.
What is an accumulation point? A point x in a topological space X such that in any neighborhood of x there is a point of A distinct from x.
Examples of intervals. [0;5,5[ - 5<x<45 - ]-∞;3]
Examples of domain. 4/x-2 D: x-2≠0 x≠2 √(4x-3) D: 4x-3>=0

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