Why does the limit of 1/x² not exist as x approaches zero?

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SUMMARY

The limit of 1/x² as x approaches zero does not exist because it approaches infinity, which is not a real number. The discussion confirms that for any large positive number M, there exists an interval around zero such that if x is within that interval, 1/x² exceeds M. This establishes that the limit diverges rather than converging to a finite value.

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Homework Statement


Show limit 1/x^2 when x approaches zero does not exist.


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The Attempt at a Solution


What I do is suppose the limit exists,say L.Then I show that for all real number L, the limit does not approaches L. In this case, I separate L into different cases. Can anyone help me to check is this a valid prove.
 
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Yes, that is a valid approach.
 
\lim_{x \to 0}\frac{1}{x^2} = \infty

Since ∞ is not a real number the limit above is said not to exist. This limit means that for any large, positive number M, there is some interval around 0 such that if x is in that interval, 1/x2 > M.
 

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