Convergence of Harmonic Series with Omitted 9s in Denominator

In summary, a convergent series is a mathematical series that approaches a finite limit as the number of terms increases. The convergence of a series is determined by taking the limit of the series as the number of terms approaches infinity. A convergent series has a finite limit while a divergent series does not. The partial sums of a convergent series can be used to estimate its limit and are important in real-world applications such as physics, engineering, and economics.
  • #1
Nobody1111
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In the harmonic series 1+1/2+1/3+1/4+... we omit expressions which contain digit 9 in denominator (so we omit e.g. 1/9, 1/19, 1/94, 1/893, 1/6743090 etc.). Proof that such series is convergent.

Have You got any idea how to solve this problem?

Thanks a lot for help
 
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  • #3
I'd forgotten I'd proved this result... I didn't check the dates, but is it exactly one year on? Same course, same homework different year?
 

What is a convergent series?

A convergent series is a mathematical series in which the sum of its terms approaches a finite limit as the number of terms increases.

How is the convergence of a series determined?

The convergence of a series is determined by taking the limit of the series as the number of terms approaches infinity. If this limit exists and is finite, then the series is said to converge.

What is the difference between a convergent and divergent series?

A convergent series has a finite limit as the number of terms approaches infinity, while a divergent series does not have a finite limit and either grows or oscillates indefinitely.

What is the relationship between a convergent series and its partial sums?

The partial sums of a convergent series approach its limit as the number of terms increases. As a result, the partial sums can be used to estimate the value of the limit.

How are convergent series used in real-world applications?

Convergent series are used in a variety of fields, including physics, engineering, and economics, to model and analyze real-world phenomena. They can also be used to solve equations and make predictions about the behavior of systems.

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