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dmatador
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ehhh
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This does not work, as the limit of the denominator is 0. Distributing the limit over a quotient is only valid if the limit exists and the limit of the denominator is non-zero. However, you can get a working proof if you multiply both sides by [itex]\lim_{x\rightarrow c} x - c[/itex].dmatador said:[tex]
f'(c) = \lim_{x\to c}\frac{f(x) - f(c)}{x - c}
[/tex] ...since it is differentiable at any arbitrary point.
[tex]
f'(c) = \frac{\lim_{x\to c}f(x) - \lim_{x\to c}f(c)}{\lim_{x\to c}(x - c)}
[/tex] ...using properties of the limit (i think).
slider142 said:This does not work, as the limit of the denominator is 0. Distributing the limit over a quotient is only valid if the limit exists and the limit of the denominator is non-zero. However, you can get a working proof if you multiply both sides by [itex]\lim_{x\rightarrow c} x - c[/itex].
dmatador said:OK, I think I see that. After that you can pull out the limit sign and cancel out the x - c and are left with [tex] 0 = \lim_{x\to c}f(x) - f(c)[/tex]. The proof is basically done.
Differentiable refers to a mathematical function that is smooth and has a well-defined slope at every point in its domain. This means that the function can be continuously and smoothly traced without any sharp turns or corners.
Differentiability is a stronger condition than continuity. A function that is differentiable at a point must also be continuous at that point, but the reverse is not necessarily true. This means that all differentiable functions are also continuous, but not all continuous functions are differentiable.
No, a function cannot be differentiable if it is not continuous. This is because differentiability requires the function to be continuous at every point in its domain. If there are any discontinuities in the function, it cannot be differentiable.
A function that is continuously differentiable means that it is differentiable at every point in its domain, and its derivative is also a continuous function. This implies that the function has no sharp turns or corners, and its slope changes smoothly throughout its domain.
Yes, differentiability and continuity are essential concepts in many fields, including physics, engineering, economics, and computer science. They are used to model and analyze real-world phenomena, such as motion, optimization problems, and data analysis.