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Mr Davis 97
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I've learned that composition of continuous functions is continuous. ##\log x## and ##|x|## are continuous functions, but it seems that ##\log |x|## is not continuous. Is this the case?
Mr Davis 97 said:I've learned that composition of continuous functions is continuous. ##\log x## and ##|x|## are continuous functions, but it seems that ##\log |x|## is not continuous. Is this the case?
Because of the vertical asymptote at 0?Math_QED said:Why is ##\log|x|## not continuous?
Mr Davis 97 said:Because of the vertical asymptote at 0?
In this theorem you must also trace carefully domains of the functions. The exact formulation is as follows. Let ##X,Y,Z## be topological spaces and ##f:X\to Y,\quad g:Y\to Z## be continuous functions. Then the function ##g\circ f:X\to Z## is a continuous function.Mr Davis 97 said:I've learned that composition of continuous functions is continuous
Mr Davis 97 said:I've learned that composition of continuous functions is continuous. ##\log x## and ##|x|## are continuous functions, but it seems that ##\log |x|## is not continuous. Is this the case?
"Continuity of composition of continuous functions" refers to the concept in mathematics that states if two functions are continuous, then their composition (or combination) is also continuous.
To define continuity of composition of continuous functions, we use the epsilon-delta definition. That is, for any epsilon (ε) greater than 0, there exists a delta (δ) greater than 0 such that whenever the distance between the input values of the two functions is less than delta, the distance between their output values is less than epsilon.
Continuity of composition of continuous functions is important because it allows us to extend the concept of continuity to combinations of functions. This is essential in many areas of mathematics and science, such as calculus, where we often use composite functions to model real-world phenomena.
Pointwise continuity refers to the continuity of a function at a specific point, while uniform continuity refers to the continuity of a function over an entire interval. In other words, pointwise continuity deals with the behavior of a function at a single point, while uniform continuity deals with the behavior of a function over a larger range.
No, a composition of two non-continuous functions cannot be guaranteed to be continuous. In order for a composition of functions to be continuous, both individual functions must be continuous. If one or both of the functions are non-continuous, then their composition will also be non-continuous.