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  1. sequences and series - What is the sum of an infinite resistor ladder ...

    Dec 10, 2023 · Here's a proof by induction that the resistance of a finite version of this ladder with $\ n\ $ rungs is indeed homogeneous of degree $1$ in the variable $\ R\ .$ Taking the limit as $\ …

  2. Ramanujan's radical and how we define an infinite nested radical

    Feb 20, 2019 · The user @Eevee Trainer provided a nice explanation on how we define infinite nested radical in terms of limit of finite nested radical which should be insensitive of the starting point.

  3. How can Cyclic groups be infinite - Mathematics Stack Exchange

    Oct 4, 2020 · I am a little confused about how a cyclic group can be infinite. To provide an example, look at $\\langle 1\\rangle$ under the binary operation of addition. You can never make any negative …

  4. I have learned that 1/0 is infinity, why isn't it minus infinity?

    An infinite number? Kind of, because I can keep going around infinitely. However, I never actually give away that sweet. This is why people say that 1 / 0 "tends to" infinity - we can't really use infinity as a …

  5. linear algebra - What can be said about the dual space of an infinite ...

    The dual space of an infinite-dimensional vector space is always strictly larger than the original space, so no to both questions. This was discussed on MO but I can't find the thread.

  6. functional analysis - What is a good textbook to learn about infinite ...

    Jan 31, 2025 · There are the following textbooks to learn about infinite-dimensional manifolds: "The Convenient Setting of Global Analysis" by Andreas Kriegl and Peter W. Michor

  7. Infinite Series $\\sum 1/(n(n+1))$ - Mathematics Stack Exchange

    Write out a few terms of the series. You should see a pattern! But first consider the finite series: $$\sum\limits_ {n=1}^ {m}\left (\frac {1} {n}-\frac {1} {n+1 ...

  8. How do you prove that a group specified by a presentation is infinite ...

    17 Grigory has already answered your particular question. However, I wanted to point out that your question "How do you prove that a group specified by a presentation is infinite?" has no good answer …

  9. Infinite summation formula for modified Bessel functions of first kind

    Jan 8, 2019 · Infinite summation formula for modified Bessel functions of first kind Ask Question Asked 7 years, 3 months ago Modified 1 year, 8 months ago

  10. Is there a shape with infinite area but finite perimeter?

    Dec 1, 2014 · But the circumference also defines the subset with infinite area that lays "outside" (which is a conventional concept). That other "outside shape" would be an example of a finite-perimeter …