Inverse Functions f ^-1 (y) and the Logarithm x = ln y | Summary and Q&A

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September 16, 2010
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Inverse Functions f ^-1 (y) and the Logarithm x = ln y

TL;DR

Inverse functions are created by reversing the input and output of a function, and logarithms are the inverse function of e to the x. Logarithms are important because they allow us to solve for x in the equation e^x = y.

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Key Insights

  • ◀️ Inverse functions are created by reversing the input and output of a function.
  • ☺️ Logarithms are the inverse function of e to the x, and they allow us to solve for x in the equation e^x = y.
  • 🪡 Functions need to be one-to-one in order for the inverse function to be well-defined.

Transcript

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Questions & Answers

Q: What is an inverse function?

An inverse function is created by reversing the input and output of a function. It allows us to find the original input from the output.

Q: Why are inverse functions important?

Inverse functions are important for solving equations and finding the original input from the output. They allow us to "undo" the actions of a function.

Q: What is the logarithm?

The logarithm is the inverse function of e to the x. It allows us to solve for x in the equation e^x = y.

Q: Why do functions need to be one-to-one for the inverse function to be well-defined?

Functions need to be one-to-one, meaning that each x corresponds to only one y, in order for the inverse function to be well-defined. This ensures that the inverse function does not result in multiple inputs for a single output.

Summary & Key Takeaways

  • Inverse functions are created by reversing the input and output of a function, and they are important for solving equations and finding the original input from the output.

  • The logarithm is the inverse function of e to the x, and it allows us to solve for x in the equation e^x = y.

  • It is important for the functions to be one-to-one, meaning that each x corresponds to only one y, in order for the inverse function to be well-defined.

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