# Show that the Integral of 1/x from 0 to 1 Diverges | Summary and Q&A

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June 22, 2023
by
The Math Sorcerer
Show that the Integral of 1/x from 0 to 1 Diverges

## TL;DR

The video shows that the integral from 0 to 1 of 1 over x diverges due to an infinite discontinuity at zero.

## Key Insights

• ☺️ The integral from 0 to 1 of 1 over x is an improper integral due to an infinite discontinuity at zero.
• 🥡 To evaluate an improper integral with an infinite discontinuity, the endpoint is replaced with a variable and a limit is taken.
• 0️⃣ The limit as the variable approaches zero from the right results in the natural logarithm of the absolute value of zero, which is negative infinity.
• ☺️ The graph of the natural logarithm function has a vertical asymptote at x equals zero, causing the integral to diverge to positive infinity.
• ♾️ Divergence occurs when an integral evaluates to infinity, negative infinity, or does not exist.
• #️⃣ Convergence would be indicated if the integral gave a finite number as a result.
• 🍵 Understanding the concept of an improper integral and how to handle infinite discontinuities is essential in calculus.

## Transcript

in this video we're going to show that the integral from 0 to 1 of 1 over x with respect to X diverges note that this is an improper integral because it has what's called an infinite discontinuity at zero and zero is one of the limits of integration let's go ahead and work through it solution we'll start by writing down our integrals so we have the... Read More

## Questions & Answers

### Q: Why is the integral from 0 to 1 of 1 over x considered improper?

The integral is improper because it has an infinite discontinuity at zero, which is one of the limits of integration. This creates a challenge in the evaluation process.

### Q: How is the infinite discontinuity at zero handled in the calculation?

To handle the infinite discontinuity, the endpoint zero is replaced with a variable, denoted as 'B'. The limit as 'B' approaches zero from the right is then taken.

### Q: What does the integral of 1 over x with respect to x result in?

Integrating 1 over x with respect to x yields the natural logarithm of the absolute value of x. This is a well-known result in calculus.

### Q: Why does the integral diverge instead of converging to a finite value?

The integral diverges because, as 'B' approaches zero from the right, the natural logarithm of the absolute value of 'B' approaches negative infinity. The presence of a negative sign in the expression results in the integral diverging to positive infinity.

## Summary & Key Takeaways

• The video demonstrates the process of evaluating the integral from 0 to 1 of 1 over x, which is an improper integral.

• An infinite discontinuity at zero poses a challenge, leading to the substitution of the endpoint with a variable.

• The limit as the variable approaches zero from the right results in the natural logarithm of the absolute value of zero, which is negative infinity. Consequently, the integral diverges.

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