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Treadstone 71
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Can someone give me an example of a function that is continuous everywhere yet differentiable nowhere?
hypermorphism said:See Mathworld, Planetmath and Wikipedia. Fractal curves are usually defined recursively. Details of each curve can be found in their respective articles.
The Weierstrass function is a related pathology. Weierstrass was one of the mathematicians (including Dedekind, Cantor, Kronecker, and so forth) that heralded the 2nd age of rigor, which put on firm ground many concepts that were previously nebulous in definition and application. Many pathologies were created at this time.
My applied analysis textbook cover said:Mr.Cauchy anounces that, in order to conform to the will of the Council, he will not anymore take care of providing, as he has done up until now, perfectly rigourous proofs of his statements.
Council of instruction of l'École Polytechnique,
november 24 1825
leon1127 said:i have a stupid question
Can you even take derivative if it is not continuous?
Assume it is not continuous at point C, then the limit of the slope approve to C from both sides should not be equal, thus derivative does not exist and nondifferentiable.
leon1127 said:i have a stupid question
Can you even take derivative if it is not continuous?
Assume it is not continuous at point C, then the limit of the slope approve to C from both sides should not be equal, thus derivative does not exist and nondifferentiable.
So it means that suck function doesn't exist?benorin said:Continuity is a neccessary, but not a sufficient condition for differentability. So no, you cannot differentiate a non-continuous function.
Treadstone 71 said:Can someone give me an example of a function that is continuous everywhere yet differentiable nowhere?
Just about every calculus book has a proof that a function is differentiable at c only if it is continuous at c. There is no such function.leon1127 said:i have a stupid question
Can you even take derivative if it is not continuous?
Assume it is not continuous at point C, then the limit of the slope approve to C from both sides should not be equal, thus derivative does not exist and nondifferentiable.
A function is a mathematical rule that relates one input value to one output value. It can also be thought of as a machine that takes in a number and produces another number as a result.
One example of a function is the linear function f(x) = 2x + 3. This function takes in any number (x) and multiplies it by 2, then adds 3 to the result to produce an output value.
A function is a type of relation where each input value (x) is paired with only one output value (y). In other types of relations, one input value may have multiple output values. Essentially, a function is a more specific type of relation.
To graph a function, you plot points on a coordinate plane using the input values (x) and their corresponding output values (y). Then, you connect the points with a smooth line to represent the function.
The domain of a function is the set of all possible input values (x) for which the function is defined. The range of a function is the set of all possible output values (y) that the function can produce. In other words, the domain is the set of all x-values and the range is the set of all y-values.