Continuity: Definition & Inequality Signs

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    Continuity Definition
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SUMMARY

The discussion centers on the strict inequality signs in the definitions of continuity and limits in mathematical analysis. Participants assert that the strict inequalities, such as |f(x) - L| < ε and |x - a| < δ, are essential for precise definitions of continuity. The consensus is that these conventions ensure the function approaches a limit without actually reaching it, which is crucial for the integrity of calculus. The discussion concludes that while the strictness may seem arbitrary, it serves a fundamental purpose in maintaining the rigor of mathematical definitions.

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  • Familiarity with the epsilon-delta definition of continuity
  • Basic knowledge of real analysis
  • Concept of sequences and their convergence
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Bleys
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I'm just wondering why in the definition of continuity, limit of function, or even just limit of a sequence, the inequality signs are strict? What would happen if you only required that
| f(x) - L |\leq \epsilon. Or that |x-a|\leq \delta.
 
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Without giving it much thought, I suspect it doesn't matter whether the inequalities are strict or not.
 
So it was simply decided that the definition had this: it's just convention then? There is no special case that required them to be this way?
 

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