Well Behaved Function: Definition & Physical Phenomenon

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SUMMARY

A "well behaved function" (WBF) in the context of physical phenomena is defined as a function that is continuous and differentiable at all points, ensuring that the gradient remains continuous. In quantum mechanics (QM), a WBF typically requires that the second derivative, u", is finite for smooth potentials, although higher derivatives may be discontinuous. For cases involving a delta function potential, a well behaved wave function can exhibit a discontinuous first derivative, highlighting the nuanced nature of WBFs in different scenarios.

PREREQUISITES
  • Understanding of continuous and differentiable functions
  • Knowledge of quantum mechanics principles
  • Familiarity with derivatives and their continuity
  • Concept of delta function in potential theory
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  • Study the properties of continuous and differentiable functions in calculus
  • Explore the implications of the delta function in quantum mechanics
  • Research the role of higher-order derivatives in physical models
  • Examine case studies of well behaved functions in various physical phenomena
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Students and professionals in mathematics, physics, and engineering, particularly those studying quantum mechanics and mathematical modeling of physical systems.

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.
 

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