Well Behaved Function: Definition & Physical Phenomenon

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In summary, a "well behaved function" refers to a function that represents a physical phenomenon and is continuous and differentiable at all points, with a continuous gradient. The requirement for higher order derivatives to be continuous may vary depending on the problem, but in quantum mechanics, a "well behaved function" typically means that the second derivative is finite, even if higher derivatives may be discontinuous. For example, in the case of a delta function potential, a "well behaved wave function" can have a discontinuous first derivative.
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sachi
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We are asked to explain what is meant by a "well behaved function" which represents a physical phenomenon. I know that it has to be continuous, and differentiable at all points (therefore we need the gradient to be continuous), but I'm not sure if derivatives of all orders need to be continuous, although this seems intuitively correct.
 
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"WBF" depends on the problem.
In QM, it generally means that u" is finite (for a smooth potential), but u" and higher derivatives can be discontinuous, and usually are.
If the pot is a delta function, then a "well behaved wave function" can have a discontinous first derivative.
 

Related to Well Behaved Function: Definition & Physical Phenomenon

What is a well-behaved function?

A well-behaved function is a mathematical function that has a consistent and predictable behavior. This means that for a given input, the function will always produce the same output, and the function will not exhibit any strange or unexpected behavior.

What are some examples of well-behaved functions?

Examples of well-behaved functions include linear functions, polynomial functions, and trigonometric functions. These functions have smooth and continuous graphs, and their behaviors can be easily predicted using mathematical rules.

What is the physical phenomenon associated with well-behaved functions?

The physical phenomenon associated with well-behaved functions is the idea that in the natural world, many physical quantities can be described by mathematical functions that exhibit consistent and predictable behavior. This allows scientists to model and understand various phenomena, such as motion, sound, and light.

Why is it important for a function to be well-behaved?

A well-behaved function is important because it allows for accurate and reliable predictions and calculations. In scientific research and engineering, well-behaved functions are used to model and analyze physical systems, and any unexpected behavior can lead to errors and inaccuracies in the results.

Can all functions be considered well-behaved?

No, not all functions can be considered well-behaved. Some functions may exhibit strange or unexpected behavior, such as discontinuities, infinite values, or non-uniqueness. These functions are often avoided in scientific and mathematical applications because they can lead to incorrect or nonsensical results.

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