How can f(x, y) be defined on y=x for a continuous function?

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In summary, the function f: ℝ² → ℝ : (x,y) |--> {{x^3-y^3}\over{x-y}} can be defined on the line y=x as f(x, y)= x^2+ xy+ y^2= 3x^2 to create a continuous function.
  • #1
Alexx1
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How can the function

f: ℝ² → ℝ : (x,y) |--> [tex]{{x^3-y^3}\over{x-y}}[/tex] if x ≠ y

be defined on the line y=x so that we get a continuous function?Is this correct?: If x=y --> f=0
 
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No. Did you have any reason at all for thinking that?

For [itex]x- y\ne 0[/itex]
[tex]\frac{x^3- y^3}{x- y}= x^2+ xy+ y^2[/itex]

As long as x is NOT equal to y, that function is the same as [itex]x^2+ xy+ y^2[/itex]. The function will be continuous on the line the line x= y, if we define [itex]f(x, y)= f(x, x)= x^2+ xy+ y^2= x^2+ x^2+ x^2= 3x^2[/itex], not "0".
 
  • #3
HallsofIvy said:
No. Did you have any reason at all for thinking that?

For [itex]x- y\ne 0[/itex]
[tex]\frac{x^3- y^3}{x- y}= x^2+ xy+ y^2[/itex]

As long as x is NOT equal to y, that function is the same as [itex]x^2+ xy+ y^2[/itex]. The function will be continuous on the line the line x= y, if we define [itex]f(x, y)= f(x, x)= x^2+ xy+ y^2= x^2+ x^2+ x^2= 3x^2[/itex], not "0".

Thank you very much!
 

Related to How can f(x, y) be defined on y=x for a continuous function?

1. What is continuous extension?

Continuous extension is the process of extending or expanding a scientific theory or concept over time. It involves continuously building upon existing knowledge and making new discoveries to further understand a particular subject or phenomenon.

2. How is continuous extension important in scientific research?

Continuous extension is crucial in scientific research because it allows scientists to continually improve upon and refine their understanding of a particular topic. It also helps to expand the scope of scientific knowledge and can lead to new breakthroughs and innovations.

3. What are some examples of continuous extension in scientific research?

There are many examples of continuous extension in scientific research, such as the development of new technologies, the discovery of new species, and the refinement of existing theories. For instance, the theory of evolution has undergone continuous extension as new evidence and research has been conducted.

4. How does continuous extension differ from other scientific processes?

Continuous extension is often confused with scientific methods such as experimentation and data analysis. However, continuous extension is a broader concept that encompasses these processes and refers to the ongoing growth and development of scientific knowledge over time.

5. What are some challenges associated with continuous extension in scientific research?

One challenge of continuous extension is the potential for bias or preconceived notions to influence the interpretation of new data. Additionally, the rapid pace of technology and information can make it difficult for researchers to keep up with the latest advancements and incorporate them into their work.

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