
What exactly is infinity? - Mathematics Stack Exchange
It is just what you want it to be, as long as it makes sense mathematically. We can talk about $+\infty$ and $-\infty$ in the extended real line, and about $\infty$ in the extended comlex plane. We can talk …
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 $\ …
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 …
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
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 ...
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 …
general topology - Is there any continuous transformation on a …
Jan 23, 2022 · This means that for infinite entropy we can't have differentiable self-maps of compact manifolds or Lipschitz self-maps of compact metric spaces of finite lower box dimension. The …
Set of Linear equation has no solution or unique solution or infinite ...
Set of Linear equation has no solution or unique solution or infinite solution? Ask Question Asked 12 years, 3 months ago Modified 6 years, 3 months ago
What are some examples of infinite dimensional vector spaces?
Jan 26, 2021 · I would like to have some examples of infinite dimensional vector spaces that help me to break my habit of thinking of $\\mathbb{R}^n$ when thinking about vector spaces.
Can a countable set contain uncountably many infinite subsets such …
Dec 15, 2025 · Can a countable set contain uncountably many infinite subsets such that the intersection of any two such distinct subsets is finite?